The correct title of this article is about:config entries. It appears incorrectly here due to in the wiki software. This is not the place to. This is a reference to the entries in, where all user preferences can be viewed and modified.

In most cases the list below doesn't state whether a given preference applies to all, or only some (and which), of,,, or even the now discontinued: trial and error is often the only way to tell if some particular preference applies to your version of your application. Users not already familiar with about:config entries should read the companion article,, which describes how to modify values and work with the about:config list. This article does not contain a complete list of all preferences. If you don't find an entry below for a given preference, check the (multiple-page) listing, which includes many new preferences that have not been added here, as well as those preferences that have been migrated from sections of this article. Also check for a listing of Thunderbird and Mozilla Suite/SeaMonkey mail and news preferences. Alternative lists can be found here: • • • • • (For a comparison view of table and actual about:config settings, use the extension or the new version of to show one above the other.

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Also, finding item documentation for a preference from within can be sped up with the extension, which adds a context menu item to search Google for the selected preference item.) Note: There is no indication in the table as to which items will take effect immediately, with a new window, or require restarting. Spaces between the dots in preference names on this page exist purely for word-wrapping. They are actually not present and should not be thought as so. Editors of this page must take care to follow this convention in order to not force users to horizontally scroll this article.

Name Type Meaning of Values bidi. Ui Boolean True: Activates bidi interface and keyboard unconditionally False: Only activates bidi interface and keyboard in bidi locales. (Default) bidi. Characterset Integer How the browser determines the character set to use 1 (default): Document-specified character set 2: Default character set bidi. Controlstextmode Integer How controls are used 1 (default): Logical 2: Visual (this is no longer supported and leads to strange side-effects, see ) 3: Container bidi. Direction Integer Select direction of text 1 (default): Left-to-right 2: Right-to-left bidi. Numeral Integer How numerals are displayed 0 (default): Nominal numerals 1: Regular context numerals 2: Hindi context numerals 3: Arabic numerals 4: Hindi numerals bidi.

Support Integer Select provider of bi-directional support 1 (default): Mozilla 2: OS 3: Disable bidi. Texttype Integer Type of text 1 (default): Charset 2: Logical 3: Visual.

Name Type Meaning of Values String The default color for active links as a hex code. Default is #EE0000. String The default color for links as a hex code.

Default is #0000EE Note: This can be changed in Firefox via ' → Content / Fonts & Colors → Colors. → Link Colors → Unvisited Links' ( Firefox 1.5 and above) and via 'Edit → Preferences → Appearance → Colors / Link Colors → Unvisited Links' in Mozilla Suite and SeaMonkey. Integer Determines the behavior of the backspace key 0: Goes back in history 1: Acts as Page Up 2 (and above): Does nothing Note: See (Mozilla Suite) Boolean True (default): Use of the blink tag or 's will result in blinking elements. False: Blinking is disabled. Boolean True: Links with target set to _blank will open in the current tab instead of a new window. False: Links with target set to _blank will open in a new window. Note: No longer in use.

Use browser.link.open_newwindow instead. Boolean Keeps track of whether a root folder for system (imported) bookmarks has been created in bookmarks.html. True: The root folder has been created False (default until import complete): Create the root folder (unless we're using dynamic bookmarks - browser.bookmarks.import_system_favorites), and then set this pref to true.

String The full path and filename of your bookmarks file ( bookmarks.html). In Windows, the path separator must be two backslashes (e.g. ' C: Path To bookmarks.html') if the value is being set in user.js or prefs.js instead of within about:config Boolean Determine the system bookmark strategy. True: Enable a 'live view' of system bookmarks which is read-only False (default): Opposite of above. Note: Setting this to 'true' will prevent 'Imported IE Favorites' folder from being deleted where applicable (see ).

Integer The number of seconds between Live Bookmark checks. Values under 60 are assumed to be 60; the default is 3600 (1 hour). Boolean True: Overwrite the current file with the default set of bookmarks. False (default): Do not reset bookmarks.

Note: Firefox 1.5 and above only String The order in which to sort bookmarks in the Bookmarks Manager descending (default): Unsorted natural: Alphabetically, A-Z ascending: Alphabetically, Z-A Note: In Firefox, this can be changed via 'Bookmarks → Organize (or Manage) Bookmarks. → View' String The RDF source to use when sorting the bookmarks in the Bookmarks Manager rdf:(default) - by bookmark name rdf:- by URL rdf:- by bookmark keyword rdf:- by description rdf:- by bookmark creation date rdf:- by bookmark modification date rdf:- by date of last visit Note: In Firefox, this can be changed via 'Bookmarks → Organize (or Manage) Bookmarks. → View' Integer How often to check the remote page for a newer version than what might be in the cache 0: Check once per browser session 1: Check every time I view the page 2: Never check (always use cached page) 3 (default): Check when the page is out of date (automatically determined) Integer Amount of disk space allowed for the browser's cache (in KB).

Default is 50000. Note: In Firefox, this can be changed via ' → Advanced → Network / Offline Storage' (Firefox3), Tools → Options → Advanced → Network / Cache' (Firefox 2) or 'Tools → Options → Privacy → Cache (Firefox 1.5 and earlier); in Mozilla Suite/SeaMonkey, via ' → Advanced → Cache'. Boolean True (default): Use disk cache, up to capacity specified in browser.cache.disk.capacity False: Disable disk cache (same effect as setting browser.cache.disk.capacity to 0) String Full path to the parent directory of the Cache folder used for storing the browser's cache. In Windows, the path separator must be two backslashes (e.g. ' C: Path To Parent Folder') if the value is being set in the user.js or prefs.js instead of within about:config. Boolean True (default): Cache content received via SSL False: Do not cache content received via SSL Note: See for more information Integer Determines how the browser uses RAM for cache.

-1 (default): as a percentage of physical RAM 0: disables the memory cache device entirely (n): Set the maximum RAM used to n KB. Boolean True (default): Use memory cache, up to capacity specified in browser.cache.memory.capacity (if set); otherwise, use a percentage of physical RAM (see ) False: Disable memory cache (same effect as setting browser.cache.memory.capacity to 0) Boolean True (default): Load and display 'favicons' residing in the current page's site root directory False: Opposite of the above Note: This should be set to the same value as browser.chrome.site_icons for legacy reasons.

Integer If an image's height or width is greater than this number (in pixels), the image will not have a thumbnail placed in its tab (or the ). Setting it to 0 will prevent thumbnails from being used altogether. The default value is 1024 pixels.

Note: Firefox 1.5 and above and SeaMonkey only. Integer 0 (default): Never load site icons/favicons when displaying bookmarks in menus (overrides browser.chrome.site_icons) 1: Load site icons/favicons when they've been cached 2: Always load site icons/favicons Boolean True (default): Load and display site icons specified by link element(s) in the web page False: Opposite of the above Note: This should be set to the same value as browser.chrome.favicons for legacy reasons. Integer Set toolbar style for browser 0: Pictures Only 1: Text Only 2 (default): Pictures and Text Boolean Determines tooltip behavior for chrome elements. True (default): Show tooltips for toolbars and bookmarks. Display the name and URL for bookmarks False: Hide tooltips for chrome elements String Location of browser's UI chrome; launched at browser startup. Default value is chrome://browser/content/ String The default color for the background of browser content as a hex code. This affects blank tabs, web pages whose backgrounds are not explicitly set, and XUL error pages.

Default value is #FFFFFF. Note: In Firefox, this can be changed via ' → Content / Fonts & Colors → Colors. → Text and Background → Background ' ( Firefox 1.5 and above). String The default color for the background of focused elements as a hex code. Default value is #117722. Requires that browser.display.use_focus_colors be true Boolean True: Display the focus ring (normally only shown on links) on anything False (default): Display the focus ring on links only Integer Determines the display of the focus ring around focused elements.

0: Hide focus ring 1 (default): Dots around focused elements will be displayed with a 1 pixel border (n): Display dots with a width of n pixels around focused elements browser. Focus_text_color String The default color for the text of focused elements as a hex code. Default value is #ffffff. Requires that browser.display.use_focus_colors be true browser. Force_inline_alttext Boolean True: Force broken images' alt text to be displayed inline False (default): Show an icon if rendering in Quirks Mode and there is no alt text, or if rendering in Quirks Mode and the image has a size specified.

Foreground_color String The default color for the foreground of browser content as a hex code. This affects web pages whose text colors are not explicity set and XUL error pages. Default value is #000000.

Note: In Firefox, this can be changed via ' → Content / Fonts & Colors → Colors. → Text and Background → Text' ( Firefox 1.5 and above). Normal_lineheight_calc_control Integer Determine method of calculating line-height (leading) in layout -1: Uninitialized 0: Don't include external leading 1: Use what the font vendor provides 2 (default): Compensate leading if vendor's leading is insufficient Integer Firefox 1.5 only DPI of display device. Affects absolute length units (e.g. -1 (default): Use the operating system's logical resolution or 96 DPI, whichever is greater 0: Force use of operating system's logical resolution (n): Assume screen DPI of n. Default DPI is 96.

Note: In Firefox, this can be changed via ' → Content → Advanced → Display Resolution'. See for Firefox 1.0.x or for Firefox 2.0+. Show_image_placeholders Boolean True (default): Show placeholders while image is loading False: Opposite of above browser. Use_document_colors Boolean True (default): Allow documents to specify colors to use False: Opposite of above Note: In Firefox, this can be changed via ' → Content / Fonts & Colors → Colors → Allow pages to chose their own colors, instead of my selections above' ( Firefox 1.5 and above). Use_document_fonts Integer 0: Never use document's fonts 1: Allow documents to specify fonts to use 2: Always use document's fonts (deprecated) Note: In Firefox, this can be changed (between 0 and 1) via ' → Content / Fonts & Colors → Advanced → Allow pages to chose their own fonts, instead of my selections above' ( Firefox 1.5 and above).

In SeaMonkey, the corresponding setting is → Appearance → Fonts → [√] Allow documents to use other fonts browser. Use_focus_colors Boolean True: Set colors on focused items according to preferences False (default): Do not set colors on focused items browser. Use_system_colors Boolean True: Use colors specified by OS to display documents False (default): Opposite of above Note: In Firefox, this can be changed via ' → Content / Fonts & Colors → Colors → Use system colors' ( Firefox 1.5 and above).

Disabled Boolean True: Disables emulation of IE's document.all collection False (default): Enable undetectable document.all support in quirks mode (see ) browser. Disabled Boolean True: Disable the more aggressive emulation of IE's 'IDs directly accessible in the global scope' behavior. False (default): Automatically add IDs to the global ( window) scope in quirks mode. Enabled Boolean True: Enable False: Opposite of the above browser. DefaultFolder String Holds the path of the default download directory determined from browser.download.folderList.

Not set by default; set after the user configures their download options. Dir String The last directory used for saving a file from the 'What should (browser) do with this file?' DownloadDir String Determines the directory to download to when browser.download.useDownloadDir is false. Appears to mirror browser.download.dir. FolderList Integer Which of several internally-specified locations to use for the default download directory 0: the desktop 1 (default): the downloads folder 2: the last folder specified for a download Note: In Firefox, this can be changed via ' → Main / Downloads → Save files to. (Firefox 2 and above) or Downloads/Download Folder → Save all files to this folder' (Firefox 1.5). Hide_plugins_without_extensions Boolean True (default): In the Download Actions dialog, remove entries where no file extensions are associated with a plugin.

False: Opposite of the above. LastDir String Path to the last directory used for a download via 'Save As.'

AlertOnEXEOpen Boolean True (default): warn the user attempting to open an executable from the Download Manager False: display no warning and allow executable to be run Note: In Firefox, this can be changed by checking the 'Don't ask me this again' box when you encounter the alert. CloseWhenDone Boolean True: Close the Download Manager when all downloads are complete False (default): Opposite of the above Note: In Firefox, this can be changed via ' → Main / Downloads → Close it when all downloads are finished' (Firefox 2 and above) or Downloads / Download Manager → Close the Download Manager when all downloads are complete' (Firefox 1.5). FlashCount Integer Number of times to flash the Download Manager's taskbar entry when the DM is not in the foreground. Set to 0 to disable flashing. Default value is 2. FocusWhenStarting Boolean True: Set the Download Manager window as active when starting a download False (default): Leave the window in the background when starting a download browser.

OpenDelay Integer If a download takes less than this number of milliseconds to complete, do not open the Download Manager window. Default value is 0 (always show Download Manager window). Retention Integer When to remove downloaded files' entries from the Download Manager 0: Upon successful download 1: When the browser exits 2 (default): Manually Note: In Firefox, this can be changed via ' → Privacy / History → Remember what I've downloaded' (Firefox 2 and above) or 'Privacy → Download History → Remove files from the Download Manager' (Firefox 1.5). ShowAlertInterval Integer Number of milliseconds after downloads complete to show the 'completed' alert. Default value is 2000.

ShowAlertOnComplete Boolean True (default): popup window at bottom right corner of the screen will appear once all downloads are finished. False: the popup window will not appear. Boolean True (default): Scan files for viruses when they finish downloading False: Do not scan downloads for viruses browser. ShowWhenStarting Boolean True (default): Show Download Manager window when a download begins False: Opposite of the above Note: In Firefox, this can be changed via ' → Main / Downloads → Show the Downloads window when downloading a file' ( Firefox 2 and above) or ' → Downloads / Download Manager → Show Download Manager when a download begins' ( Firefox 1.5) Boolean True: Bypass the Windows security check (ignore system security settings for executable file downloads). False: (default) Use Windows' security setting for executable file downloads ('Launching applications and unsafe files' setting in Internet Options). This if the Windows setting is set to 'Disable'. Note: Added in for Firefox 3 (3.0.6, 3.1b2 and above).

No longer used in Firefox 3.6 and above (removed in ). UseWindow Boolean True: Use the Download Manager window for downloads False: Opposite of the above Note: In Firefox, this is effectively the same as setting browser.download.manager.showWhenStarting to false; the Download Manager is used for downloads regardless of the setting. Note: This was removed in for Firefox 3.1. Save_converter_index Integer The format to save web pages in 0: Web Page (Complete) 1: Web Page (HTML Only) 2: Text Note: In Firefox, this setting is remembered from the option you choose in the Save As dialog.

Show_plugins_in_list Boolean True (default): In the Download Actions dialog, display actions and filetypes associated with installed plugins. False: Opposite of the above. UseDownloadDir Boolean True (default): Without asking a location, download files to the directory specified in browser.download.folderList False: Ask where to save every file Note: In Firefox, this can be changed via ' → Main / Downloads → Always ask me where to save files (Firefox 2 and above) or Downloads / Download Folder → Ask me where to save every file' (Firefox 1.5) browser. Enable_automatic_image_resizing Boolean True (default): When viewing an image not in a web page, the image will be resized to fit in the browser window if it is too large for the browser window. The image can be shown in its real size by left clicking on it.

False: Images are always shown in their real size. Note: In Firefox, this can be changed via ' → Advanced → General → Resize large images to fit in the browser window ( Firefox 1.0.x and 1.5)'. UI removed in Firefox 2.0+. ArticleLength Integer Previously: The number of words per feed item to display. Default value is 50. Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta.

ReloadInterval Integer Previously: Determines how often in seconds to reload the currently rendered feed. Default value is 0 (never reload). Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta. ShowBar Boolean Previously: True (default): Display the options settings in feed view. False: Opposite of the above Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta.

ShowImage Boolean Previously: True (default): Display images embedded in feed items in-line. False: Opposite of the above. Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta. ShowMenu Boolean Previously: True (default): Display a menu alongside rendered feeds with relevant functions False: Opposite of the above. Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta. TimerInterval Integer Previously: Determines how often to refresh the feed.

Default value is 0 (no refresh). Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta. ExternalCSS String Previously: Path to a custom CSS file to apply to feeds. Default value is an empty string.

Note: Feedview functionality was present for only a short while prior to Firefox 1.5 Beta. Enabled Boolean True (default): Try to fix up to False: Do not second-guess the user browser.

Prefix String The prefix to prepend when attempting to fix an entered URL. Default is ' www.'

(includes full stop). Requires browser.fixup.alternate.enabled be true. Suffix String The suffix to append when attempting to fix an entered URL. Default is '.com'.

Requires browser.fixup.alternate.enabled be true. Hide_user_pass Boolean True (default): When attempting to fix an entered URL, do not fix an entered password along with it (i.e. Do not turn into but instead False: Include entered password in fixed URL browser. Use-utf8 Boolean Firefox 11 / SeaMonkey 2.8 and above only. Default: false (but true on zh-TW localized builds). Enable Boolean True (default): Save information entered in web page forms and the False: Opposite of the above Note: In Firefox, this can be changed via ' → Privacy / History → Remember what I enter in forms and the search bar' ( Firefox 2 and above) or ' → Privacy → Saved Forms → Save information I enter in forms and the ' ( Firefox 1.5) browser. Backwards_compatible Boolean True (default): Leave off mandatory Content-Transfer-Encoding header when submitting HTML forms False: Send header as the spec requires Note: Sending the header 'used to cause Bad Things, including server crashes' according to comments in the Mozilla source (see ).

Eventually this pref may disappear. Enabled Boolean True (default): Enables the display of HTML frames False: Opposite of the above; displays content instead Integer Controls toolbar and tab strip animation while in Full Screen.

0: No toolbar and tab strip animation 1 (default): Animates only first collapse. 2: Animates each collapse. Boolean Hides toolbar and tab strip when entering Full Screen. True (default): Shows toolbar and tab strip. False: Hides toolbar and tab strip browser. Enabled Boolean True (default): If a normal DNS lookup times out, try hitting Google False: Opposite of the above Note: No longer used browser. Force Boolean True: Always ask what to do with an unknown MIME type, and disable option to remember what to open it with False (default): Opposite of above browser.

DeleteTempFileOnExit Boolean True: Delete temporary files on exit. See (especially Mac) False (same as default unset): Opposite of above (keep the files) browser. OpenFile String A comma-separated list of MIME types to open directly without asking for confirmation.

Default value is an empty string. SaveToDisk String A comma-separated list of MIME types to save to disk without asking what to use to open the file. Default value is an empty string. HiddenWindowChromeURL String The chrome:// URL for the hidden window. Used in Mac OS X for when the browser is running but has no windows open. Default value is chrome://browser/content/hiddenWindow.xul browser. Grouping String How to group entries in the history window (not applicable for Firefox's History sidebar).

Default value is day. Integer Number of maximum days to remember visited pages in history. Default value is 9 for SeaMonkey and Firefox 2, 180 for Firefox 3. Note: In Firefox 2, this can be changed via ' → Privacy → History → Remember visited pages for the last ___ days'. No UI for Firefox 3. Integer Number of minimum days to remember visited pages in history.

Default value is 90. Note: In Firefox 3, this can be changed via “Keep my history for at least ___ days” under “ → Privacy → History” Integer Maximum number of websites to keep in history. Default value is 40000. Disabled Boolean The collective state of several other preferences; namely, dom.event.contextmenu.enabled, dom.disable_window_move_resize, dom.disable_window_flip, dom.disable_window_open_feature.status, and dom.disable_window_status_change.

Used by the preferences dialog for tracking; changing the value of this preference manually does not change the tracked preferences. True: Consider all of the above preferences to be true (except dom.event.contextmenu.enabled, which is considered to be false) False (default): Opposite of the above Note: Firefox 1.5 and above only. Integer Where to open links sent to the browser from an external application 2 (default in SeaMonkey): Opens external links in a new window 3 (default in Firefox): Opens external links in a new tab in the most recent window 1 (or anything else): Opens external links in current window Note: In Firefox 1.5, this can be changed via ' → Tabs → Open links from other applications in:'; in Firefox 2 and above, via “Tools → Options → Tabs → New pages should be opened in:” (same as browser.link.

Open_newwindow) and in SeaMonkey, via ' ->Navigator ->Tabbed browsing / Links from other applications ->Open links passed from another applications in'. Open_newwindow Integer Where to open links that would normally open in a new window 2 (default in SeaMonkey and Firefox 1.5): In a new window 3 (default in Firefox 2 and above): In a new tab 1 (or anything else): In the current tab or window Note: In Firefox 1.5, this can be changed via ' → Tabs → Force links that open new windows to open in:'; in Firefox 2 and above, via “Tools → Options → Tabs → New pages should be opened in:” (same as ) and, in SeaMonkey, via ' ->Navigator ->Tabbed browsing / Link open behavior ->Open links meant to open a new window in'. Integer Firefox and SeaMonkey only. 0 (Default in Firefox 1.0.x and SeaMonkey): Force all new windows opened by JavaScript into tabs. 1: Let all windows opened by JavaScript open in new windows.

(Default behavior in IE.) 2 (Default in Firefox 1.5 and above): Catch new windows opened by JavaScript that do not have specific values set (how large the window should be, whether it should have a status bar, etc.) This is useful because some popups are legitimate — it really is useful to be able to see both the popup and the original window at the same time. However, most advertising popups also open in new windows with values set, so beware. Ui Integer Determine which new window open options are available from the UI. No longer used in Firefox 1.0. Default value is 3. Boolean True (default): Allow the to retrieve information for bookmarks with microsummaries. False: Prevent microsummary updates to bookmarks.

Integer Determines how often to check for updates to microsummary generators when generator updates are enabled. A non-negative integer, in seconds, determining the amount of time between microsummary generator update checks. If unspecified, updates occur weekly (7 * 86400 seconds apart). Integer Determines how long to wait for a response until the connection is cancelled. A positive integer determining the number of seconds to wait until cancelling microsummary loads that take too long. Default value is 300. Boolean True (default): Periodically check for updates to microsummary generators.

False: Do not update microsummary generators. Integer Determines how often microsummaries’ target pages are re-fetched for new information. Number of minutes between microsummary updates for microsummaries that do not specify an update interval.

Default is 30. Offline Boolean Status of the 'Work Offline' option True: Attempt to retrieve pages from cache.

Do not make external connections to retrieve resources. False (default): Assume a connection is present and retrieve resources where necessary. Note: In Firefox, this can be changed via 'File → Work Offline' Boolean True: A 'Most Viewed' folder in the Bookmarks Toolbar Folder has been created already; do not create a new one. False (default): Create a 'Most Viewed' folder in the Bookmarks Toolbar Folder, then toggle this preference to True. ShowPopupBlocker Boolean True (default): Show an icon in the status bar when a popup has been blocked. False: Do not show an icon in the status bar when a popup has been blocked. SelectedTabIndex Integer Determines which tab in the Advanced section of the preferences is visible.

0 (default): General 1: Update 2: Security browser. AnimateFadeIn Boolean True (default in Mac OS X): When switching prefs panels, change the height of the window and fade the new panel in over about a second.

False (default everywhere else): Do not animate switching pref panels Note: Firefox 1.5 and above only. InstantApply Boolean True (default in all platforms but Windows): Changes to preferences are active immediately. The preferences window is not modal.

Instead of 'OK' and 'Cancel' buttons, there is only a 'Close' button. False: Changes to preferences occur after clicking 'OK' button. The preference window is modal. Applies to: • Firefox 1.5 and above • SeaMonkey 2 dated 20071028 and later, for preferences migrated to 'new toolkit'. Lastpanel Integer Which part of the preferences window was displayed the last time it was closed. In Firefox: 0: General 1: Privacy 2: Web Features 3: Downloads 4: Advanced Note: In Firefox, this is determined by the section of ' you are viewing when you close the dialog. SelectedTabIndex Integer Determines which tab in the Privacy section of the preferences is visible.

0 (default): History 1: Saved Forms 2: Passwords 3: Download History 4: Cookies 5: Cache browser. Autoload Integer Automatically load 'What's Related' for a given URL 0: Always 1 (default): After first use (default) 2: Never Note: This is not used in Firefox (there is no 'What's Related'). DisabledForDomains String A comma-separated list of domains for which 'What's Related' is disabled. Default value is an empty string. Note: This is not used in Firefox (there is no 'What's Related').

Boolean Setting for 'What's Related' True (default): Enable False: Disable Note: This is not used in Firefox (there is no 'What's Related'). Provider String The URL to retrieve 'What's Related' data from.

Default value is? Note: This is not used in Firefox (there is no 'What's Related'). Integer The provider ID of the site used to get the web forgery list. Default value is 0. Note: This references the pref tree Boolean Whether to determine if a site is a web forgery or not. True (default): Check visited sites False: Do not check any sites Note: This can be changed in Firefox via ' → Security / Tell me if the site I'm visiting is a suspected forgery'. Tree Tree containing provider information used in the safe browsing process.

Note: There is currently only one default provider (Google); however, more may be added. Boolean Method to determine if a site is a web forgery. True: Ask provider by sending a request False (default): Use internal list Note: This can be changed in Firefox via ' → Security' radio buttons: * 'Check using a downloaded list of suspected sites' (False) * 'Check by asking ____ about each site I visit' (True). Note: When an internal list is used, it is updated about once an hour from the provider. String The FAQ URL for the Safe Browsing feature. Integer Firefox 1.0.x only DPI of display device. Affects absolute length units (e.g.

-1 (default): Use the operating system's logical resolution or 96 DPI, whichever is greater 0: Force use of operating system's logical resolution (n): Assume screen DPI of n. Default DPI is 96. Note: In Firefox 1.0.x, this can be changed via ' → General → Fonts & Colors → Display Resolution'.

See for Firefox 1.5.0.x or for Firefox 2.0+. Min_ver String Version number used to determine which should be installed/displayed. Default value is 0.0.

Defaultenginename String Default to use. Default value is Google. Defaulturl String URL to prepend to search terms. Default value is Boolean True: Log debugging information about the search service to the and stdout.

False (default): Do not log debugging information. Note: Firefox 2.0 and above only. Openintab Boolean True: When performing a search from the Search Bar, open the results in a new tab.

False (default): Open search results in the current tab/window. Note: Firefox nightly trunk builds only. (digit) String (digit) is used to weight the search engine specified by the value for sorting in the list of search engines. Digit) String Used for weighting search engine entry sorting.

Points to.properties file. ('custom' or 'default') String Used for adding arbitrary variables to the search query of the (name) search plugin. SelectedEngine String Name of currently selected search engine plugin browser. SelectedEngineInDialog String Name of currently selected search engine plugin in the search dialog (used when the is hidden) Note: Firefox 1.5 and above only. ShowOneOffButtons Boolean True (default): field of unlabeled search icons covering viewing area when typing into search bar (introduced in Firefox 34) False: Restore pre Firefox 34 search engine drop-down selection and customization menu. Restart Firefox to effect change.

Update Boolean True (default): Automatically check for updates to. False: Opposite of the above. Note: Firefox 1.5 and above only. Cache_subframes Boolean True: Cache the content viewer (when browser.sessionhistory.max_total_viewers is greater than 0) for subframes False (default): Opposite of the above Note: Firefox 1.5 and above only. Max_entries Integer The maximum number of pages in the browser's session history, i.e. The maximum number of URLs you can traverse purely through the Back/Forward buttons.

Default value is 50. Integer Determines the maximum number of content viewers to cache for 'bfcache' (fast back/forward navigation). Default value is -1 (calculate based on available memory). All values less than 0 are equivalent. Note: Firefox 1.5 and above only. Supersedes browser.sessionhistory.max_viewers. Max_viewers Integer The number of content viewers to cache for 'bfcache' (fast back/forward navigation).

Default value is 3. Note: Deer Park/Firefox 1.5b1 only. Functionality has been replaced by browser.sessionhistory.max_total_viewers. Integer Firefox 4.0b7 and above; also SeaMonkey 0: Number of tabs which may restore at the same time. Default value is 3.

CheckDefaultBrowser Boolean Check the system on startup. True (default): Check to see if the browser is set as default; if not, ask if the user wants it set that way False: Do not perform the check Note: In Firefox, this can be changed via ' → Main / System Defaults' (Firefox 2.0 and above) or 'Tools → Options → General → Default Browser' (Firefox 1.5 and 1.0.x). Homepage String URL of homepage, or pipe ( )-separated list of URLs to open in tabs when going to the homepage In SeaMonkey (or at least in SeaMonkey 2 and above), this is the URL of your first or only homepage tab.

If you have a multitab homepage, additional URLs are in browser.startup.homepage.1, browser.startup.homepage.2, etc. Note: This can be changed in Firefox via ' → Main (Firefox 1.5 and 1.0.x: General) → Homepage' and in SeaMonkey via ' → Browser → Home Page'. Count Integer In SeaMonkey, the number of tabs of your multitab homepage, or 1 if you use a single-tab homepage. 1 Boolean Stub for browser.startup.homepage_override (used in Netscape 4.x). No longer used. Default value is false. Mstone String The last browser version (milestone) this profile was loaded with.

If it differs from the current version, pref is changed to current version. Homepage_reset String If, during installation, the user requested that their homepage be reset, get the new homepage value from this location. Default value is resource:/browserconfig.properties browser.

Page Integer Page to open on browser startup 0: Blank 1 (default): Home (a.k.a. Browser.startup.homepage) 2: Last (works in Firefox 2 and above; experimental in the latest nightlies of SeaMonkey 2.0b1pre; probably doesn't work in earlier versions). Note: This can be changed in Firefox via ' → Main → Startup → When Firefox starts', and in SeaMonkey via ' → Browser → Display on → Browser startup'. AutoHide Boolean Behavior for the tab bar when only one tab exists True (default): Hide the tab bar False: Always show the tab bar Note: In Firefox, this can be changed via ' → Tabs → Always show the tab bar' (Firefox 2 and above) or Tools → Options → Tabs → Hide the tab bar when only one web site is open ( Firefox 1.5). Integer (Firefox 2.0 and above) This preference controls how close buttons can be displayed on tabs.

0: Display a close button on the active tab only 1: (default) Display a close button on each tab 2: Don't display any close buttons 3: Display a single close button at the end of the tab bar (Firefox 1.x behavior) Note: Firefox 31 removed these choices, install to restore these options. CloseWindowWithLastTab Boolean (Firefox 3.5 and above) This preference controls whether closing the last tab, closes the window. True: Close window when closing last tab (default) False: Do not close the window when closing last tab (pre Firefox 3.5 behavior) Note: Changing to False prevents Firefox from closing the window when you close the last tab such as with Ctrl+W, and subsequently from closing Firefox itself when closing the last tab of the last Firefox window. ForceHide Boolean Display of the tab bar True: Hide the tab bar False: Show tab bar normally Note: This is not used to enable/disable the tab bar. It's used internally to decide whether or not to show the tabbed bar. InsertRelatedAfterCurrent Boolean (Firefox 3.6 and above) This preference controls where new tabs will be located. True (default): Open new tabs to the right of the parent tab.

False: Restores pre Firefox 3.6 behavior where new tabs are opened at the far right of the tabs bar. Note: browser. LoadBookmarksInBackground Boolean Focus behavior of new tabs from bookmarks & history True: When you open a bookmark in a new tab then that tab will load in the background without taking focus from the current tab. False (default): When you open a bookmark in a new tab then that tab will become the current tab.

Note: you likely want to set this to the same setting value as used in browser.tabs.loadInBackground () Note: Firefox 1.0.x had a Tabs option for 'Select New Tabs from Bookmarks or History' browser. LoadDivertedInBackground Boolean Determines behavior of pages normally meant to open in a new window (such as target='_blank' or from an external program), but that have instead been loaded in a new tab. True: Load the new tab in the background, leaving focus on the current tab False (default): Load the new tab in the foreground, taking the focus from the current tab. Note: Setting this preference to True will still bring the browser to the front when opening links from outside the browser.

Note: target='_new' creates/reuses a window named '_new' and is frequently used by Google. Target='_blank' loads the designated document in a new, unnamed window [ ]. Boolean True (default): When opening a folder of bookmarks in tabs, the existing tabs will be replaced by the new bookmark pages. False: Existing tabs will be preserved when loading a folder of bookmarks.

The bookmark pages will be loaded in tabs that are appended to the current tabs. Note: This option was removed in Firefox 3 alpha 8. Integer 0: Append group to current tab set 1 (default): Replace current tab set with group Note: Mozilla Suite/SeaMonkey only. LoadInBackground Boolean Focus behavior for new tabs from links True (default): Do not focus new tabs opened from links (load in background) False: Opposite of above Note: bookmarks & history can be opened similarly with browser.tabs.loadBookmarksInBackground Note: In Firefox, this can be changed via ' → Tabs → When I open a link in a new tab, switch to it immediately' ( Firefox 2 and above) or ' → Tabs → Select new tabs opened from links' ( Firefox 1.5). LoadOnNewTab Integer Determines what will be displayed in a new tab -1: Browser startup page 0 (default): Blank page 1: Homepage 2: Last visited page Note: Does not work in Firefox (see ). OnTop Boolean (Firefox 4.0 and above) Determines position of the Tabs Bar relative to the Location Bar.

True (default): Tabs Bar above Location Bar False: Restores old behavior of Tabs Bar Location Bar Note: will soon remove tabs-on-bottom mode. Once it is RESOLVED FIXED, this pref will no longer be effective. Bookmarks Boolean Controls if a clicked bookmark will open in a new tab when middleclicked. Middleclick Boolean Determines the behavior of a link when middle-clicked. True (default): Opens link in new tab False: Opens link in new window browser.

Searchdialog Boolean Determines whether to create a new tab for the search results from queries entered in the search dialog (used when the is hidden) Note: Firefox 1.5 and above only. Urlbar Boolean.

Previously: Determines the behavior of pressing Enter in the address bar or clicking the Go button. True (default): Open URL in new tab False: Open URL in current tab Note:. Windowopen Boolean. ShowSingleWindowModePrefs Boolean Determines whether to display 'Single Window Mode' settings in preferences in Firefox 1.0.x (see ). Note: and True: Show 'Force links that open in new windows to open in.'

Options under ' → Advanced → Tabbed Browsing' ( Firefox 1.0.x) False (default): Opposite of above browser. WarnOnClose Boolean True (default): The browser will prompt for confirmation when closing the browser when more than one tab is open. False: No warnings will be given when closing the browser with more than one tab. Note: In Firefox, this can be changed via ' → Tabs → Warn (me) when closing multiple tabs' ( Firefox 1.5 and above). WarnOnCloseOther Boolean True (default): The browser will prompt for confirmation when closing all other tabs from the tab context menu ('Close Other Tabs') False: Opposite of the above browser.

Url String Indicates what URL to load when the throbber is clicked. Default value is Boolean Unused Boolean True (default): Select the entire paragraph under the mouse cursor when triple-clicking. False: Select the line under the mouse cursor when triple-clicking Note: This feature is currently only stable on trunk (1.9). Enabled Boolean. Previously: Determined whether to load browser in 'Turbo Mode' (aka 'quick launch') (Windows/Mozilla Suite only) True: Load some Mozilla code into memory on Windows boot False (default): Load browser normally on program execution Boolean Determines default text-decoration of anchor elements. True (default): Underlines links False: Opposite of above Note: In Firefox, this can be changed via ' → Content → Fonts & Colors → Underline links' browser.

ResetHomepage Boolean Determine whether to reset homepage during browser installation True: Reset homepage in browser.startup.homepage to value in browser.startup.homepage_reset False (default): Do not reset homepage browser. AutoFill Boolean True: Enables. False (default): Opposite of above. Enabled Boolean True (default) False browser. ClickAtEndSelects Boolean True (default) False browser. ClickSelectsAll Boolean True (default in non-Unix builds): Select the contents of the address bar when it is clicked False (default everywhere else): Opposite of above Integer Customizes the search behavior of the location bar, starting in Firefox 3.5 and SeaMonkey 2.

See the linked article for values and UI. DoubleClickSelectsAll Boolean True: Select the contents of the address bar when it is double clicked False(default): Opposite of above Boolean True (default): Filter out “javascript:” URLs from appearing in the Location Bar autocomplete dropdown. False: Allow “javascript:” URLs to appear in the dropdown. Enabled Boolean True (default): Format url in location bar to emphasize domain name. False: Don't fade non domain portions of url in location bar. Title String See browser.

Url String See Integer Determines how to use word boundaries when searching for items in the. 0 Search anywhere within available text, irrespective of word boundaries. 1 (default): Use word boundaries first when searching, then try matching anywhere 2: Use only word boundaries when searching for typed text 3: Match only the beginning of page URLs and titles browser. MatchOnlyTyped Boolean Determines behavior of autocomplete in.

No longer used in Firefox 3.5 - replaced by (see bugs and ) True: Only matches typing against URLs specifically typed into Location Bar False (default): Match against history Boolean Determines behavior of autocomplete in True (default): Use word boundaries when searching for typed text in the Location Bar autocomplete. False: Search anywhere within available text, irrespective of word boundaries. Integer Determines how many entries should appear (at most) in the dropdown in. Bookmark String See browser. History String See browser.

Tag String See browser. Typed String See Integer Number of dropdowns to fetch at a time. Default is 1000. Integer Number of milliseconds to wait between fetching batches of dropdown items. Default is 100 (1/10th of a second). ShowPopup Boolean True (default) False browser.

ShowSearch Boolean True (default) False browser. TrimURLs Boolean True (default): Trim 'prefix from url address displayed in location bar. False: Don't trim url in location bar. String The default color for visited links as a hex code.

Default is #551A8B Note: In Firefox, this can be changed via ' → Content → Fonts & Colors → Visited Links' Integer Set what should be displayed in a newly created window -1: Browser Startup Page 0: Blank Page 1 (default): Your Homepage 2: Last Visited Boolean True (default in Firefox 1.5 and above and SeaMonkey): The browser will use error pages. False (default in Firefox 1.0.x and below): The browser will use error alert boxes. Boolean True (Default): Full page zoom False: Text zoom Boolean True (Default): Remember the zoom level on a per-site basis. False: The zoom level should be applied on the current tab only. Name Type Meaning of Values Boolean Windows-only. Determines how Windows handles memory for the browser when minimizing.

Setting to False will often prevent delays when restoring the window (see ). True: Allow Windows to trim the working set when the browser is minimized False (default): Prevent Windows from trimming the working set config. Use_system_prefs Boolean True: Use preferences set by operating system (e.g. Proxies, accessibility) False (default): Opposite of the above Note: Seems to be unused in Firefox 1.0 config. Accessibility Boolean True: The system is configured with accessibility features; use them False (default): Opposite of the above Note: Seems to be unused in Firefox 1.0. Name Type Meaning of Values dom. Allow_scripts_to_close_windows Boolean Determines which close() operations are legal.

True: Any script may close any window False (default): Only windows opened via script may be closed via close(). Disable_image_src_set Boolean Determines whether scripts may change the.src member of image objects (effectively, whether images can be changed via ) True: Scripts may not modify.src of images False (default): Opposite of above Note: In Mozilla Suite, this can be changed via 'Edit → Preferences → Advanced → Scripts & Plug-ins → Allow scripts to: Change images' and, in Firefox 1.0.x, via ' → Web Features → Enable JavaScript / Advanced → Allow scripts to: Change images'.

This option has been removed from the UI in Firefox 1.5 dom. Disable_open_click_delay Integer If a popup will be created as the result of a setTimeout() or setInterval() call and the delay specified is smaller than this value (in milliseconds), handle the popup according to the current popup blocker settings. Default value is 1000.

Disable_open_during_load Boolean Determines popup blocker behavior True (default in Firefox): Block popup windows created while the page is loading False (default in Mozilla Suite): Allow popup windows Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Block Popup Windows' and, in Mozilla Suite, via 'Edit → Preferences → Privacy & Security → Popup Windows → Block unrequested popup windows. Disable_window_flip Boolean Determines whether windows can be focus()ed via non-chrome. True (default in Mozilla Suite): Windows may not be set as active via JavaScript False (default in Firefox): Opposite of the above Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Enable JavaScript / Advanced → Allow scripts to: Raise or lower windows' and, in Mozilla Suite, via 'Edit → Preferences → Advanced → Scripts & Plug-ins → Allow scripts to: Raise or lower windows'. Disable_window_move_resize Boolean Determines whether windows can be moved or resized via non-chrome. True (default in Mozilla Suite): Windows may not be moved or resized via JavaScript False (default in Firefox): Opposite of the above Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Enable JavaScript / Advanced → Allow scripts to: Move or resize existing windows' and, in Mozilla Suite, via 'Edit → Preferences → Advanced → Scripts & Plug-ins → Allow scripts to: Move or resize existing windows'.

* Boolean Webpage authors can disable many features of a popup window that they open. Setting these preferences to true will override the author's settings and ensure that that feature is enabled and present in any popup window. Close: Prevents the close button from being disabled. Directories: Prevents the bookmarks toolbar from being hidden.: Prevents the address bar from being hidden menubar: Prevents the menubar from being hidden. Minimizable: Prevents popup window minimization from being disabled.

Personalbar: Prevents the bookmarks toolbar from being hidden. Resizable: Prevents popup window resizing from being disabled. Scrollbars: Prevents the scrollbars on a popup from being disabled.: Prevents the status bar from being hidden. Titlebar: Prevents the title bar from being hidden. Toolbar: Prevents the navigation toolbar from being hidden. Disable_window_status_change Boolean Determines whether the text in the browser status bar may be set by non-chrome. True (default in Firefox): JavaScript access to window.status is disabled False (default in Mozilla Suite): Opposite of the above Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Enable JavaScript / Advanced → Allow scripts to: Change status bar text' and, in Mozilla Suite, via 'Edit → Preferences → Advanced → Scripts & Plug-ins → Allow scripts to: Change status bar text'.

Enabled Boolean Determines whether the oncontextmenu event can be caught by non-chrome (e.g., in an anti-right-click script). True (default): the opposite of below. False: Webpages will not be able to affect the context menu event, thus allowing to access the context menu all the time. Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Advanced → Allow scripts to: Disable or replace context menus' and, in Mozilla Suite, via 'Edit → Preferences → Advanced → Scripts & Plug-ins → Allow scripts to: Disable or replace context menus'.

Enabled Boolean Determines whether plugins will run in a separate 'plugin-container' process. See for details. Can be overridden for plugins specified by filename (). True (default in Firefox 4 on Windows and Linux): Run plugins out-of-process, except for 'blacklisted' plugins set in dom.ipc.plugins.enabled. With value false (see below). False (default in Firefox 3.6.x on Windows and Linux, and in Firefox 4 on Mac OS): Do not run plugins out-of-process, except for 'whitelisted' plugins set in dom.ipc.plugins.enabled. With value true (see below).

Note: First shipped in Firefox 3.6.4 for Windows and Linux only, with the plugins Adobe, Apple (Windows) and Microsoft Silverlight (Windows) whitelisted by default dom. Boolean Overrides dom.ipc.plugins.enabled (see above) for plugins specified by filename (plugin filenames can be found in and must be specified in lowercase). True: Run the specified plugin in a separate 'plugin-container' process. False: Do not run the specified plugin out-of-process (run within the browser process).

Windows examples: Microsoft Silverlight: dom.ipc.plugins.enabled.npctrl.dll Apple QuickTime: dom.ipc.plugins.enabled.npqtplugin.dll Adobe Flash (listed as 'Shockwave Flash'): dom.ipc.plugins.enabled.npswf32.dll test plugin: dom.ipc.plugins.enabled.nptest.dll Linux examples: Adobe Flash (listed as 'Shockwave Flash'): dom.ipc.plugins.enabled.libflashplayer.so NPAPI test plugin: dom.ipc.plugins.enabled.libnptest.so Mac examples: (Firefox 4) Adobe Flash (listed as 'Shockwave Flash'):dom.ipc.plugins.enabled.flash player.plugin Java: dom.ipc.plugins.enabled.javaplugin2_npapi.plugin dom. TimeoutSecs Integer Number of seconds before an is terminated, when the browser detects that the plugin or plugin script has stopped responding.

Default is 45 in Firefox 3.6.6 (increased from 10). Set the value to -1 to disable plugin hang detection, so that the browser does not terminate plugins that stop responding Note: First shipped in Firefox 3.6.4 for Windows and Linux. And Integer Determines the maximum amount of time in seconds a script can run (with chrome or content privileges, respectively). Default values are 20 and 10 respectively. Zero or negative values mean 'forever'.

See the details pages for former behaviour (prior to 2006-07-27). 2012-08-21: New default for chrome is 0 (forever) on SeaMonkey and Thunderbird, except on Linux, see dom. Min_background_timeout_value Integer See the. String A space-separated list of the events that are allowed to create popups.

Default value is ' change click dblclick mouseup pointerup notificationclick reset submit touchend'. A presumably complete list of events from: Form events: select: change: input: submit: reset: Other events: keydown: keypress: keyup: mousedown: mouseup: click: dblclick: error: Integer The maximum number of simultaneously open popup windows.

Default value is 20. These settings affect libeditor (i.e. Composer and Mail). Most have no effect in Firefox. Name Type Meaning of Values editor.

Background_color Boolean Determines background color for Thunderbird editor; other forks' behaviour unknown. #000000: Use black instead of white in editor. Works well in conjunction with.text_color, but if HTML mail is sent, it's odd to some folks.; an invert_display option would be more practical, but doesn't exist (yet).* preferences for content #FFFFFF (default) editor. Default_length_unit String Determines the default units for rules. Cm: centimeters em: ems (width of the capital letter 'M' in typography, but line height in CSS) ex: ex (height of the lower-case 'x') in: inches mm: milimeters%: percentage of parent element pc: picas (1/6th of an inch) px (default): pixels pt: points (1/72nd of an inch) editor. HtmlWrapColumn Integer The column at which HTML source wraps. Default value is 72.

Offset Integer The default offset, both X and Y, of absolutely positioned elements. Default value is 0.

QuotesPreformatted Boolean Originally meant to be a to control the behavior of plaintext quotations inserted into email. True: Wrap quoted email text in a pre element False (default): Wrap quoted email text in a span element editor. Preserve_ratio Boolean Determines the behavior of resizing images in Composer. True (default): Preserve ratio of image while resizing False: Allow free resizing of height and width Integer Determines the behavior when pasting content containing newlines into single-line text boxes. 0 (default in Linux): Paste content intact (include newlines) 1 (default everywhere else): Paste the content only up to (but not including) the first newline 2: Replace each newline with a space 3: Remove all newlines from content 4: Substitute commas for newlines in text box 5: Remove all newlines and surrounding whitespace editor.

Use_css Boolean Determines the preferred method of formatting content. True (default): Use CSS styling where appropriate False: Use non-CSS methods of styling content editor.

Use_custom_colors Boolean Determines whether to use user-specified colors for content. No effect in Thunderbird. True: Use colors specified in editor.* preferences for content False (default): Use the default colors. The majority of the font.* entries are of the form: font.(font property).(font type).() The (font property) indicates that the value of the entry is one of the following: name-list A comma-and-space-delimited list of font names corresponding to the (font type) and (language code) (String) name A font name (String) size The font size, in pixels (Integer) The (font type) indicates which is being referenced in the value, or simply whether the font is fixed-width or variable-width. The (font type) is one of the following: serif (e.g. Times) sans-serif (e.g.

Helvetica) cursive (e.g. Zapf-Chancery) fantasy (e.g. Western) monospace (e.g. Courier) fixed Any fixed-width font variable Any variable-width font The (language code) is an. Other font.* entries are listed below. Name Type Meaning of Values font.

) String The default to use. If a language code is specified, the preference only applies to that language. Serif (default): Serif sans-serif: Sans-serif font. Group String The user's language group.

Pulled from the localized data at chrome://global/locale/intl.properties by default on installation. Nav4rounding Boolean. Previously: True: In Windows, False (default): Display fonts normally font. FreeType2.enable Boolean Attempt to use FreeType fonts. FreeType2.printing Boolean Attempt to use FreeType fonts when printing using the printing system. Name Type Meaning of Values general.

AutoScroll Boolean Status of the autoscroll option (middle-clicking on a web page produces a scrolling icon and will automatically scroll the page based on the pointer's relative location to the icon) True (default): Activate autoscroll False (default in *nix): Opposite of the above Note: This can be changed: - in Firefox, via ' → Advanced → General → Browsing → Use autoscrolling' - in SeaMonkey, via ' → Appearance → Content → Scrolling → Use autoscrolling' general. Filename String A.cfg file to parse and read for AutoConfig. Unset by default. Obscure_value Integer An integer to use when obscuring the AutoConfig file saved to and read from disk.

Default value is 13 (effectively, ROT-13 the content). Vendor String A vendor ID associated with the AutoConfig file. SelectedSkin String The current skin used by the browser. Default value is classic/1.0. Note: In Firefox, this can be changed via 'Tools → Add-ons → Themes' ( Firefox 2) or 'Tools → Themes' ( Firefox 1.5 and below) general. SmoothScroll Boolean Status of ths smooth scrolling option (scrolling on a web page moves page content pixelwise rather than line-by-line) True: Activate smooth scrolling False (default): Opposite of the above Note: This can be changed: - in Firefox via ' → Advanced → General → Browsing → Use smooth scrolling' - in SeaMonkey via ' → Appearance → Content → Scrolling → Use smooth scrolling' general.

Addressbook Boolean (default: false) Same as the following for the Address Book component. Browser Boolean True (default): When launching Mozilla Suite or SeaMonkey, load the browser component False: Opposite of the above Note: This preference has little to no significance in Firefox as it is only a browser. It has no effect since Firefox 1.5.

Chat Boolean (default: false) Same as above for the ChatZilla component NOTE: In Safe Mode, ChatZilla is never started regardless of this pref. Compose Boolean (default: false) Same as above for the Composer component. Editor Boolean (default: false) Same as above for the Editor component. Mail Boolean (default: false) Same as above for the Mail component. News Boolean (default: false) Same as above for the News component.

Contentlocale String The content locale specified in the string general. (product name/version) String Allows an arbitrary number of strings to be added to the end of the string. By default, general.useragent.extra. Is defined and set to /.

See for more information. Note: Only Firefox 1.5 and above, Thunderbird 1.5 and above, SeaMonkey 1.1 and above. String representing the user's language for the string general. Override String A complete string to use in place of the default. Security String Security level of the browser in the string N: No security U (default): Strong security I: Weak security general. Vendor String Vendor in the string.

Default value depends on browser ( Firefox in Firefox 1.0). Note: No longer specified by default in Firefox 1.5. VendorSub String Vendor substring in the string. Default value depends on browser version ( 1.0 in Firefox 1.0) Note: No longer specified by default in Firefox 1.5. Name Type Meaning of Values intl.

Accept_charsets String Currently unused. Previously: Character sets in which to accept data.

Default value is iso-8859-1,*,utf-8. Accept_languages String values of languages to accept.

Default value is determined by localized information in chrome://navigator/locale/navigator.properties. Default String Determines the default character set.

Default value is chrome://global-platform/locale/intl.properties intl. Detector String Determines which locale URI sets how character set are detected in the browser intl. Cache String A comma-and-space-delimited list of cached character sets for the browser intl. Size Integer Number of character sets to cache.

Default value is 5. More* String A comma-and-space-delimited list of character sets to display in the character encoding menu Note: In Firefox, these menus are viewable via 'View → Character Encoding → More Encodings' intl. Static String A comma-and-space-delimited list of character sets to always display in the character encoding menu. Note: In Firefox, this can be changed via 'View → Character Encoding → Customize List' intl. Unicode String A comma-and-space-delimited list of Unicode character sets to display in the character encoding menu Note: In Firefox, this menus is viewable via 'View → Character Encoding → More Encodings → Unicode' intl. Cache String A comma-and-space-delimited list of cached character sets for Composer intl.

Mailedit String Determines the layout of the Character Coding menu in Mozilla Mail/News (message editor) intl. Cache String A comma-and-space-delimited list of cached character sets for Mozilla Mail/News (main view) intl. CollationOption String A workaround to get correct column sorting in Mozilla Mail in Japanese builds of Linux. Default value is an empty string.

Setting it to useCodePointOrder enables the workaround (see ). Langcode String Default content language code intl. (character set) String Determines the substitute character set if (character set) is unavailable. Map String Determines the map to use for JIS X 0208 CP932 (default in Windows): Use a CP932-compatible map IBM943 (default in OS/2): Use an IBM943-compatible map intl. Per_window_layout Boolean True: Allow different windows to retain their own keyboard locale settings (see ) False (default): Opposite of the above Boolean Determines how to decide locale True: Use the locale the OS is using False (default): Use the value set in. Alwaysappendaccesskeys String Specifies URI to determine if access keys are appended to menu items intl.

Insertseparatorbeforeaccesskeys String Specifies URI to determine if there is a space before the paranthesis of the accesskey in the menu's label (see ). [] Mousewheel. Mousewheel.* settings: These fall into two groups: vertical and horizontal scrolling. The above has been changed (when?). In Gecko 50, and possibly in some earlier versions, the settings are as follows (as described by current about:config defaults and comments in the source) • a number of prefs similar to those described above, but with different 'modifier' names, and horizontal and vertical prefs grouped under the modifier, as follows: • Modifiers: •.default. • with no modifier, or with more than one, the default settings are used •.with_alt. (Command key on Mac) •.with_shift.

• Types: (defaults are given in the above order of modifiers) • action (integer) (for vertical mouse direction) (defaults: 1 2 3 1 1 1) • 0: No action • 1: Scroll contents • 2: Back/Forward in history • 3: Zoom in/out • action.override_x (integer) (for horizontal mouse direction) (defaults: all -1) • -1: Use same setting as for vertical scrolling • 0 to 3: Use this setting, same meanings as above • delta_multiplier_x (integer) (defaults: all 100) • Value (in percent) multiplied by the delta value. Direction reversed if negative. Absolute value must be 100% or larger. • delta_multiplier_y (integer) (defaults: all 100) • delta_multiplier_z (integer) (defaults: all 100) • In particular, it is no more possible to scroll by whole pages independently of the browser content height. To make shift-wheel scroll by 5 times as much as with no modifier, set mousewheel.­with_shift.­delta_multiplier_y to the value 500 (meaning 500%). Name Type Meaning of Values Boolean True (default in Windows): Use instead of for False: Opposite of the above Note: Firefox 1.5 and above only. Boolean Help Windows NT, 2000, and XP dialup a RAS connection when a network address is unreachable.

True (default): Launch dialer (if one is configured) when address is unreachable False: Display error message Boolean Enable automatic use of the operating system's NTLM implementation to silently authenticate the user with their Windows domain logon with proxy servers. (See for more information) True (default): Automatically authenticate with proxy servers False: Prompt for authentication String A comma-and-space-delimited list of URIs with which to automatically authenticate via NTLM (Windows domain logon). Default value is an empty string. (See for more information) Boolean Determines whether to accept session (kept for the duration of the browser session, then removed) if network.cookie.lifetimePolicy is 1.

True: Accept session cookies without prompting False (default): Prompt before accepting session cookies Boolean True: Allow sites to set cookies unless the user has removed cookies set by the site False (default): Removed cookies do not affect future cookie acceptance. Integer Determines how the browser should handle. 0: Enable all cookies (default) 1: Allow cookies from originating server only 2: Disable all cookies 3: Use P3P policy to decide (Mozilla Suite/SeaMonkey only) Note: In Firefox, this can be changed via ' → Privacy → Cookies → Allow sites to set cookies / for the originating web site only' ( Firefox 1.5 and below) or ' → Privacy / Cookies → Accept cookies from sites' ( Firefox 2); or, in Mozilla Suite/SeaMonkey, via ->Privacy & Security ->Cookies / Cookie Acceptance Policy. Note: The option to limit cookies to the originating server was removed from the UI in Firefox 2.

DenyRemovedCookies Boolean Seemingly unused. DisableCookieForMailNews Boolean Determines how Mozilla Mail/News should handle. Vitamaster Exercise Bike Manual.

True (default): Reject all cookies in Mozilla Mail/News False: Accept cookies normally network. EnableForCurrentSessionOnly Boolean True: Delete all at the end of the browser session False (default): Opposite of the above Note: This setting is deprecated in favor of network.cookies.lifetimePolicy (setting that to 2 is the equivalent of this preference set to True) Integer Determines the number of days to keep if network.cookie.lifetimePolicy is 3. Default value is 90. Integer Determines how browser sets lifetimes.

0 (default): Use supplied lifetime 1: Ask before accepting 2: Accept for session only 3: Cookies last for the number of days specified in network.cookie.lifetime.days Note: In Firefox, this can be changed via ' → Privacy → Cookies → Keep Cookies:' ( Firefox 1.5 and below) or via ' → Privacy / Cookies → Keep until:' ( Firefox 2). Integer Determines the maximum amount of cookies to be stored. Valid range is from 0-65535 ( and require this to be at least 300). Default value is 1000.

Integer Determines the maximum amount of cookies to be stored per host. Valid range is from 0-65535 ( and require this to be at least 20). Default value is 50. String Determines the browser's P3P handling. An 8-character string.

Default value is ffffaaaa. NGLayout stands for. These preferences are largely low-level tweaks and debug options for how content appears in the browser. Name Type Meaning of Values nglayout. Mode Integer Force a compatibility mode instead of autodetecting.

0 (default): Use supplied DTD 1: Standards compliance mode 2: Quirks mode nglayout. Checksum_xul_fastload_file Boolean True (default): Verify that the checksum of the XUL Fastload file hasn't changed since that file was last written to disk False: Don't bother verifying the checksum nglayout.

Crossing_event_dumping Boolean True: In debug-enabled builds, output information about NS_MOUSE_ENTER/ EXIT-related events to stdout when Caps Lock is on and nglayout.debug.event_dumping is true False (default): Opposite of the above nglayout. Disable_xul_cache Boolean True: (XUL, JavaScript, CSS). False (default): Cache XUL components for better performance. Disable_xul_fastload Boolean True: Disable XUL Fastload caching the in-memory compiled XUL to file ( xul.mfl, xul.mfasl) False (default): Enable XUL Fastload (see ) nglayout. Enable_xbl_forms Boolean True: Use False (default): Opposite of the above nglayout.

Event_dumping Boolean True: In debug-enabled builds, output event-related information to stdout when Caps Lock is on False (default): Opposite of the above nglayout. Invalidate_dumping Boolean True: In debug-enabled builds, output information about invalidated objects/elements to stdout when Caps Lock is on False (default): Opposite of the above nglayout. Motion_event_dumping Boolean True: In debug-enabled builds, output information about NS_MOUSE_MOVE-related events to stdout when Caps Lock is on and nglayout.debug.event_dumping is true False (default): Opposite of the above nglayout.

Paint_dumping Boolean True: In debug-enabled builds, output information about paint events to stdout when Caps Lock is on False (default): Opposite of the above nglayout. Paint_flashing Boolean True: In debug-enabled builds, flash painted elements/objects when Caps Lock is on False (default): Opposite of the above nglayout. DispatchLeftClickOnly Boolean Determines whether to dispatch left-click events only to content in the browser (chrome/XUL is exempt from the effects) True (default): Dispatch only left-click events to browser content False: Dispatch both left- and middle-click events Integer Determines time in milliseconds to wait before an initial reflow attempt during page rendering. Default value is 250 (PAINTLOCK_EVENT_DELAY). Synchronize with content.notify.interval for best performance. The module manages bookmarks and history management system through sqlite.

By default, Firefox calculates an appropriate maximum number of pages to store in the history based on the systems's available memory (etc.); history is not based on a length of time. Name Type Meaning of Values places.history.expiration.interval_seconds Integer Minimum number of seconds between expiration steps. Default is 180 seconds. Places.history.expiration.max_pages Integer The maximum number of pages that may be retained in the database before starting to expire. This preference does not exist by default, and must be created by hand in about:config with New >Integer.

Default value is calculated on startup and put into the places.history.expiration.transient_current_max_pages preference. If this preference does not exist, places.history.expiration.transient_current_max_pages is used instead. Places.history.expiration.transient_current_max_pages Integer READ ONLY: The calculated value for places.history.expiration.max_pages. You cannot change this value, and it will be used in the absence places.history.expiration.max_pages. It is helpful a helpful starting point for setting places.history.expiration.max_pages. Name Type Meaning of Values plugin.

Default_plugin_disabled Boolean True (default): When a plugin is needed, prompt the user False: Don't prompt the user to install needed plugins plugin. Disable_full_page_plugin_for_types String MIME types that would normally be opened with a plugin, except that the action has been changed in the Firefox Download Actions window. Resetting this preference changes the download action back to the plugin. Expose_full_path Boolean True: In about:plugins and navigator.plugins, reveal the full path to plugin files False (default): Show only the plugin filename plugin. Override_internal_types Boolean True: Allow plugins to override internal imglib decoder MIME types in full-page mode False (default): Opposite of the above plugin.

4xPluginFolder Boolean Controls the scanning of the Navigator 4.x directory for plugins. When this preference is missing, the default is to pickup popular plugins such as Flash, Shockwave, Acrobat, and Quicktime. If set to true, ALL plugins will be picked up and if set to false the scan will not happen at all. (Plugin) String Name of plugin to scan for, with a minimum version specified. By default, this preference exists for Acrobat (5.0), QuickTime (5.0), SunJRE (1.3), and WindowsMediaPlayer (7.0). All Boolean True (default): Locate plugins by the directories specified in the Windows registry for PLIDs (currently HKLM Software MozillaPlugins xxxPLIDxxx Path) False: Opposite of the above. Name Type Meaning of Values print.

Always_cache_old_pres Boolean True: Cache old presentation when going into Print Preview False (default): Opposite of the above print. Extend_native_print_dialog Boolean True (default): Extend the native dialog with information on printing frames. False: Opposite of the above Note: Firefox 1.5 and above only. Postscript.enabled Boolean True (default): Enable the the printing system on Linux, Unix, or VMS. False: Disable the system.

Postscript.cups.enabled Boolean True (default): Enable CUPS support within the printing system. False: Do not try to access CUPS. Print_edge_(position) Integer Determines the distance from the (position) edge of the page to measure the margin. Default value is 0.

Print_extra_margin Integer Determines an extra gap or margin in twips (90 twips is 1/8 of an inch) around the content of the page for Print Preview only. Default value is 90 (1/8').

Print_(footer or header)(position) String At the given position in the header or footer, print one of the following: &T: Title of the document &U: URL &D: Date/time &P: Page number &PT: Page number 'of' total pages (any string): A literal string with the above substitutions made print. Printer_list String Manually supplied list of printers for the printing system on Linux, Unix, or VMS. Save_print_settings Boolean True (default): Save the print settings after each print job False: Opposite of the above print. Show_print_progress Boolean True (default): Show the progress dialog when printing False: Opposite of the above print. Use_global_printsettings Boolean True (default): Every browser window uses the same print settings False: Each browser window uses its own settings, and changes in one window don't affect the others print.

Use_native_print_dialog Boolean True (default): Use the native print dialog False: Use the OS print dialog Note: Windows-only print. WhileInPrintPreview Boolean True (default): Allow printing while in Print Preview screen False: Opposite of the above. Name Type Meaning of Values privacy. Cache Boolean True (default): Clear the cache when using the Clear Private Data feature (Firefox 1.5 and above only) False: Do not clear the cache Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.'

(Firefox 2.0 and above). Cookies Boolean True: Delete all cookies when using the Clear Private Data feature (Firefox 1.5 and above only) False (default): Opposite of the above Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.'

(Firefox 2.0 and above). Downloads Boolean True (default): Clear history of downloaded files when using the Clear Private Data feature (Firefox 1.5 and above only) False: Opposite of the above Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.' (Firefox 2.0 and above). Formdata Boolean True (default): Clear all saved form data when using the Clear Private Data feature (Firefox 1.5 and above only) False: Opposite of the above Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.' (Firefox 2.0 and above).

History Boolean True (default): Clear the browsing history when using the Clear Private Data feature (Firefox 1.5 and above only) False: Opposite of the above Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.' (Firefox 2.0 and above). OfflineApps Boolean True: Clear the offline website data when using the Clear Private Data feature (Firefox 3 and above only) False (default): Opposite of the above Note: This can be changed via ' → Privacy / Private Data → Settings.' Passwords Boolean True: Delete all saved passwords when using the Clear Private Data feature (Firefox 1.5 and above only) False (default): Opposite of the above Note: This can be changed via ' → Privacy → Settings.'

(Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.' (Firefox 2.0 and above). Sessions Boolean True (default): Clear all authenticated SSL sessions when using the Clear Private Data feature (Firefox 1.5 and above only) False: Opposite of above Note: This can be changed via ' → Privacy → Settings.' (Firefox 1.5) or 'Tools → Options → Privacy / Private Data → Settings.' (Firefox 2.0 and above).

Siteprefs Boolean Planned for future use. Integer Sets limits on popups generated from plugins (e.g. Flash) 0: lets all popups through 1: limits their number to dom.popup_maximum (even with popup blocker disabled) 2: (default in Firefox 1.5 and above and SeaMonkey) blocks popups from plugins. Whitelisted sites will still be able to open popups, regardless of this setting.

3: Blocks all plugin-initiated popups, even those on whitelisted sites. FirstTime Boolean True (default): The user has never hidden the popup blocker notification bar before, so show a dialog explaining the status bar icon False: The user has been informed of the status bar icon privacy. Policy Integer Determines the popup blocker behavior.

1: Allow popups 2: Reject popups Note: Seems to be deprecated in favor of dom.disable_open_during_load privacy. ShowBrowserMessage Boolean True (default): Display a message at the top of the browser window when a popup has been blocked False: Display a status bar icon to indicate when a popup has been blocked privacy. Usecustom Boolean Seemingly unused. PromptOnSanitize Boolean True (default): Prompt before performing the Clear Private Data operation (Firefox 1.5 and above only) False: Clear Private Data without confirmation Note: In Firefox 1.5 and above, this can be changed via ' → Privacy → Settings.' SanitizeOnShutdown Boolean True: Perform the Clear Private Data operation when closing the browser (Firefox 1.5 and above only) False (default): Clear Private Data only when asked Note: In Firefox 1.5 and above, this can be changed via ' → Privacy → Settings.' Name Type Meaning of Values profile. Allow_automigration Boolean Determines how the handles automigration of Netscape 4.x profiles True: Allow automigration False (default): Opposite of the above Note: Has no effect since Gecko 1.9.0 (Firefox 3.0, SeaMonkey 2.0, Thunderbird 3.0).

Confirm_automigration Boolean True (default): Ask user before performing an automigration False: Opposite of the above profile. Manage_only_at_launch Boolean True: Only show the at program launch False (default): Show at any time via menus Note: In Firefox, there is no UI to access the Profile Manager from within the browser profile. Migration_behavior Integer Determines how the profile root is set. 0 (default): use NS_APP_USER_PROFILES_ROOT_DIR 1: create one based on the NS4.x profile root 2: Use value in profile.migration_directory (if empty, use NS_APP_USER_PROFILES_ROOT_DIR) profile.

Migration_directory String Path to directory for migration. Default value is an empty string. Seconds_until_defunct Integer Number of seconds to wait until the profile is considered defunct. Default value is -1 (never consider the profile defunct). Name Type Meaning of Values security. URL String Determines the URL to query for certificate verification/validation if security.OCSP.enabled is 2. Default value is an empty string.

Notes: In Firefox, this can be changed via ' → Advanced → Validation → OCSP → Service URL'. In SeaMonkey 2, this can be changed via ' → Privacy & Security → Validation → OCSP → Validate all certificates using the following OCSP server → Service URL'. Enabled Integer Determines behavior of -based certificate verification/validation.

0 (default in Firefox 2 and below): Do not use OCSP for certificate validation 1 (default in Firefox 3 and above): Use OCSP to validate only certificates that specify an OCSP service URL (see ). 2: Enable and use values in security.OCSP.URL and security.OCSP.signingCA for validation. Notes: In Firefox, this can be changed via ' → Advanced → Validation → OCSP'.

In SeaMonkey 2, this can be changed via the first checkbox and the radio buttons under ' → Privacy & Security → Validation → OCSP'. SigningCA String Determines the name of the signing certificate authority to use if security.OCSP.enabled is 2. Default value is an empty string.

Notes: In Firefox, this can be changed via ' → Advanced → Validation → OCSP → Response Signer'. In SeaMonkey 2, this can be changed via ' → Privacy & Security → Validation → OCSP → Validate all certificates using the following OCSP server → Response Signer'. Ask_for_password Integer Determines when Mozilla Mail should ask for the master password.

0 (default): Only the first time it's needed 1: Every time it's needed 2: Every n minutes, where n is the value in security.password_lifetime. Checkloaduri Boolean (). Previously: Determines how to handle access across schemes (e.g., ) True (default): Perform security checks and block access for insecure access False: Opposite of the above security. Default_personal_cert String Determines the selection of a security certificate to present to web sites that require one. Select Automatically (default): Automatically choose the certificate Ask Every Time: Prompt user with a choice of certificate options every time Note: In Firefox, this can be changed via ' → Advanced → Certificates → Client Certificate Selection' security.

Dialog_enable_delay Integer Amount of time in milliseconds to disable buttons on security-sensitive dialog boxes. Default value is 2000. Directory String Seemingly unused. Enable_java Boolean True (default): Java is enabled False: Opposite of the above Note: In Firefox, this can be changed via ' → Content (Web Features in Firefox 1.0.x) → Enable Java' security. Enable_ssl2 Boolean True (default in Firefox 1.5 and below): SSL 2.0 is enabled False (default in Firefox 2): Opposite of the above Note: In Firefox 1.5 and below, this can be changed via ' → Advanced → Security → Use SSL 2.0' (removed from the UI in Firefox 2).

Enable_ssl3 Boolean True (default): SSL 3.0 is enabled False: Opposite of the above Note: In Firefox, this can be changed via ' → Advanced → Security → Use SSL 3.0' security. Enable.tls Boolean True (default): TLS 1.0 is enabled False: Opposite of the above Note: In Firefox, this can be changed via ' → Advanced → Security → Use TLS 1.0' security. Password_lifetime Integer Determines how long (in minutes) to go without asking for the master password in Mozilla Mail when security.ask_for_password is 2.

Default value is 30. (ssl2 or ssl3). (cipher suite) Boolean True (default in all except the two below): The SSL 2.0 encryption type (cipher suite) is enabled False: Opposite of the above security. Rsa_null_sha Boolean True: Enable 'No encryption with RSA authentication and an SHA-1 MAC' as a cipher suite False (default): Opposite of the above security. Rsa_null_md5 Boolean True: Enable 'No encryption with RSA authentication and an MD5 MAC' as a cipher suite False (default): Opposite of the above security. Enable Boolean security.

Warn_entering_secure Boolean True (default): Display a dialog warning the user when entering a secure site from an insecure one False: Opposite of the above security. Show_once Boolean True (default): Leave the 'Alert me whenever.' Box unchecked on the security warning dialog False: Opposite of the above security. Warn_entering_weak Boolean True (default): Display a dialog warning the user when entering an insecure site from a secure one False: Opposite of the above security. Show_once Boolean True (default): Leave the 'Alert me whenever.' Box unchecked on the security warning dialog False: Opposite of the above security. Warn_leaving_secure Boolean True (default): Display a dialog warning the user when leaving a secure site False: Opposite of the above security.

Show_once Boolean True (default): Leave the 'Alert me whenever.' Box unchecked on the security warning dialog False: Opposite of the above security. Warn_submit_insecure Boolean True (default): Display a dialog warning the user when submitting a form to an insecure site False: Opposite of the above security. Show_once Boolean True (default): Leave the 'Alert me whenever.'

Box unchecked on the security warning dialog False: Opposite of the above security. Warn_viewing_mixed Boolean True (default): Display a dialog warning the user when a page has both encrypted and non-encrypted content False: Opposite of the above security. Show_once Boolean True (default): Leave the 'Alert me whenever.' Box unchecked on the security warning dialog False: Opposite of the above security. Unrestricted Boolean True (default): Allow scripting of plugins by untrusted scripts False: Opposite of the above. Name Type Meaning of Values Boolean True (default): Allows auto-filling of stored usernames and passwords on webpage forms False: Opposite of the above Added in Firefox 1.5.0.9 and 2.0.0.1; set to 'False' as workaround for signon. SignonFileName String Determines the filename that the uses for storing signon data.

Default value is signons.txt String Determines the filename that the uses for storing signon data starting in Firefox 1.5.0.10 and Firefox 2.0.0.2 (). Default value is signons2.txt signon.expireMasterPassword Boolean True: The master password for the will expire False (default): Opposite of the above signon. RememberSignons Boolean True: (default): Enable the False Opposite of the above.

These preferences are associated with, a method of moving focus on a web page with respect to the visual layout of elements. Spatial navigation is not present (compiled in) by default, so these preferences will only work in binaries compiled with ac_add_options --enable-extensions=spatialnavigation. Name Type Meaning of Values snav.

DirectionalBias Integer When calculating distances between elements on the screen, elements may be given a bias if the elements are in the direction of navigation. The bias is a given by a fraction such that: bias distance = true distance / directional bias.

The default value is 3. DisableJS Boolean True (default): Disable onFocus event that an element may recieve during spatial navigation. On some pages the page decides to move the focus as if the targeted content was clicked.

This may lead to an undesirable behavior. False: Honor onFocus handlers triggered by spatial navigation snav.

Enabled Boolean True (default): Enable spatial navigation False: Opposite of the above snav. IgnoreTextFields Boolean True (default): Ensure that text fields and inputs retain focus even if spatial navigation was requested False: Opposite of the above snav. Down String Determines the key code corresponding to downwards spatial navigation. Default value is DOM_VK_DOWN. (A complete listing of possible key codes is available in.) snav. Left String Determines the key code corresponding to left spatial navigation. Default value is DOM_VK_LEFT.

(A complete listing of possible key codes is available in.) snav. Modifier String Determines the key code corresponding to the required modifier keys. These values are given as follows: NONE: 0 SHIFT: 0x00100000 CONTROL: 0x00001100 ALT: 0x00000012 The default value is ALT SHIFT. Right String Determines the key code corresponding to right spatial navigation.

Default value is DOM_VK_RIGHT. (A complete listing of possible key codes is available in.) snav. Up String Determines the key code corresponding to upwards spatial navigation. Default value is DOM_VK_LEFT.

(A complete listing of possible key codes is available in.) snav. RectFudge Integer To reduce the chance that a element overlaps with another element, we reduce the elements height and width by this value.

Default value is 20. Name Type Meaning of Values Integer Determines how much of the text to search for matched text, specified as the number of characters from the beginning. Default is 200. Integer Determines how many milliseconds to wait before scrolling the tab strip by another increment. (Default: 150) Integer Determines how many pixels to scroll at a time when scrolling the tab strip’s scrollbox. (Default: 20) Boolean True (default): Scroll the tab strip smoothly to a newly-selected tab. False: Move to the new tab immediately.

Synchronous Integer Specify the to use. 0: risky sync mode. May cause database corruption if the OS crashes or the computer loses power. 1 (default): safe sync mode.

2: extra-slow-extra-safe sync mode. This preference was added in. At the same time, Firefox was modified to use mode 1 instead of mode 2 by default, to improve performance.

(Firefox 3) String Specify the zoom levels as multipliers that the user can use on content. Default value is.3.5.67.8.9,1,1.1,1.2,1.33,1.5,1.7,2,2.4,3. Most of these preferences control settings that the browser attempts to read from the host operating system (e.g., your current color scheme).

However, these can be overridden by manually setting the preferences to something else. For a more complete listing of the UI.* preferences, see. Name Type Meaning of Values Boolean Determines which file picker to use True (default): use the OS's standard picker if available False: Use a XUL file picker styled by your current theme, even if your OS provides its own. AccelKey Integer Determines the key code corresponding to the accelerator key.

And Update_notifications. Name Type Meaning of Values update. Interval Integer Determines how often to check extensions.update.interval and app.update.interval in milliseconds. Default value is 3600000 (1 hour). Severity Integer Used by the update system to determines when to display the icon for pending updates. 0 (default): Low severity update(s) available (extension/theme updates) 1: Medium severity update(s) available (numerous extension/theme updates) 2: High severity updates available (new version of Firefox/security patch) update.

ShowSlidingNotification Boolean True (default): Display the sliding alert when updates are available False: Opposite of the above update_notifications. Enabled Boolean True (default): Display a notification in the browser when updates are available False: Opposite of the above update_notifications. Datasource String Determines where to get update notifications. Value is pulled from chrome://browser-region/locale/region.properties.

Frequency Integer Number of days between update checks. Default value is 7. [] View_source. Name Type Meaning of Values Boolean True: The program defined in view_source. Path should be used when View Source is requested. False (default): The internal viewer should be used when View Source is requested. String Path to the external editor to use for View Source when view_source.

External is True. If the path doesn't exist or isn't a program, the internal viewer will always be used. Boolean True (default): Enable syntax highlighting in the view source window. False: Opposite of the above Note: This can be changed via 'View → Syntax Highlighting' in the view source window.

Integer sets the width of a tab character in the view source window. Already open windows aren't updated (implemented in in trunk builds (mozilla-1.9.3a1) starting 2010-02-03) Boolean True: HTML code will wrap in the view source window.

False (default): HTML code will not wrap in the view source window. Note: This can be changed via 'View → Wrap Long Lines' in the view source window. [] XPInstall.

Name Type Meaning of Values xpinstall. Confirm String Determines the chrome location of the XPInstall dialog. Default value is chrome://mozapps/content/xpinstall/xpinstallConfirm.xul. Chrome String Determines the chrome location of the extensions dialog. Default value is chrome://mozapps/content/extensions/extensions.xul?type=extensions.

Skin String Determines the chrome location of the themes dialog. Default value is chrome://mozapps/content/extensions/extensions.xul?type=themes.

Enabled Boolean True (default): Enables the XPInstall system (i.e., allows extensions to be installed) False: Opposite of the above Note: In Firefox 1.0.x, this can be changed in ' → Web Features → Allow web sites to install software' (UI removed in Firefox 1.5). Add String A comma-separated list of sites to automatically add to the extensions whitelist. Default value is update.mozilla.org,addons.mozilla.org but is cleared as soon as the values are added to the whitelist xpinstall.

Required Boolean True (default): When installing extensions from remote hosts, remote host must be on the whitelist False: Opposite of the above. [] Miscellaneous preferences See for other miscellaneous preferences related to Thunderbird and Mozilla Suite/SeaMonkey mail and news. Name Type Meaning of Values allinonegest.

* Varied These preferences are set via the extension. Use_ns_plugin_finder Boolean True: When a plugin is not found, clicking on the puzzle piece will open a dialog telling the user what plugin is needed. Clicking on the 'Get the Plugin' button brings the user to the plugins installation page. False (default): Clicking on the puzzle piece will send the user to that plugin's page on plugins.netscape.com which will have a link to that plugin's installation page. Number_of_prefs_copies Integer. Previously: number of backup copies of prefs.js to keep. Boolean True: Selecting text automatically copies it to the clipboard False (default): Opposite of the above Note:.

Header_strategy Integer How to format HTML headers ( H1- H6) when saving a web page as text-only 0: No indentation 1 (default): Indent headers based on header level (i.e. H (n+1) is indented more than H (n)) 2: Number headings and indent slightly converter. Structs Boolean Determines whether to format 'structured' elements (,,,,,,, ) with other characters when saving a web page as text-only True (default): *Strong*, /em/, code , _sub, ^sup, *b*, /i/, _u_ False: Strong, em, code, sub, sup, b, i, u custtoolbar. Personal_toolbar_folder String Custom name for the Personal Toolbar Folder. If empty (default), name is determined by string bundle or the hard-coded value 'Personal Toolbar Folder'.

String Full path to an ICM profile for output. Default is an empty string in which case the systems global profile is used. If no global profile can be found a default sRGB profile is used. Boolean True: Enable color management for rendered graphics.

False (default): Disable color management. Obsolete since 2008.

Integer When to use color management for graphics: 0: Never 1: Always 2: Only for tagged images (default) gfx. Use_text_smoothing_setting Boolean True: False (default):. Animation_mode String Determines how to animate multi-frame GIF images none: animated images will never play. Once: animated images will play once. Normal (default): animated images will play as normal. Dither String Whether to dither images auto (default): Automatically decide true: Dither images false: Disable image dithering ime. DontCare Boolean Determines how an IME editor window should react when password fields lose focus (see ).

True: Leave the IME open False (default): Re-open the IME if it was open prior to the password field's focus. Note: Firefox 1.5 and above only. DontCare Boolean Determines how an IME editor window should react when password fields gain focus (see ). True: Leave the IME open False (default): Close the IME. Note: Firefox 1.5 and above only. * Varied These entries apply to the and are only relevant if you have it installed.

String URL to use for keyword lookups. Default value in Firefox 2.0 is ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q= Boolean Determines whether to use keywords True (default): Send non-URLs entered in the to the URL specified in keyword.URL False: Disable keywords mail. Today Integer See. Integer Determines when images should be loaded. 1 (default): Load all images 2: Do not load any images 3: Load images from same (originating) server only Note: This preference was previously known as network.image.imageBehavior prior to Firefox 1.5. Url String Determines where the plugin finder service should query for plugin information. Default value is pulled from chrome://mozapps/locale/plugins/plugins.properties places.

* Integer These prefs are used for the. Converted-to-utf8 Boolean True: The preferences have been converted to UTF-8; decode as appropriate False (default): Opposite of the above roaming. Files String A comma-separated list of files that will be selected for roaming by default. Default value is bookmarks.html,abook.mab,cookies.txt.

ShowInitialWarning Boolean True (default): Display a general warning to the user about making backups, security, etc. False: Opposite of the above signed. Codebase_principal_support Boolean True: Give scripts using access advanced scripting capabilities. Setting this preference to 'true' is often used to allow IRC websites to gain access to the OS's clipboard at the expense of a security risk. False (default): Only trusted/signed scripts can access advanced scripting capabilities Note: file: and resource: schemes are considered 'special' and may get extra capabilities regardless of this preference's setting. SnapMultiplier Integer Determines the size of the scrollbar snapping region.

Default value is 6 in Windows; 0 (disabled) in *nix. String The URL that Firefox goes to when the user starts up the browser after upgrading. In Firefox, defaults to%LOCALE%/%APP%/%VERSION%/whatsnew/. String The URL that Firefox goes to when the user starts up the browser after the initial installation, or with a new profile. In Firefox, defaults to%LOCALE%/%APP%/%VERSION%/firstrun/.

Enabled Boolean True (default): On SVG-enabled builds, enables internal SVG renderer, disables externals False: Opposite of the above (see ) Integer Time stamps used by Safe Browsing in Firefox to record the latest updates downloaded and stored in. Downloading is controlled. See in the Mozilla Wiki. String Version numbers used by Safe Browsing in Firefox to record the latest updates downloaded.

Do_doublebuffering Boolean Determines whether the viewmanager should do double-buffering by default (see ). Caveat Boolean Marks whether the user has been shown the warning message regarding security risks of using the feature.

Boolean Indicates whether browser should ignore the autocomplete='off' attribute in forms.}.