Note: Spaces between the dots in preference names 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.
accessibility.* allows you to modify Find As You Type behavior, change how the [Tab] key works in web pages and XUL, turn on caret browsing, and tweak other accessibility-related features.
| Name
| Type
| Meaning of Values
|
| browser. active_color
| String
| The default color for active links as a hex code. Default is #EE0000.
|
| browser. anchor_color
| String
| The default color for links as a hex code. Default is #0000EE
Note: This can be changed in Firefox via "Tools → Options → Content / Fonts & Colors → Colors... → Link Colors → Unvisited Links" (Firefox 1.5 and above) or "Tools → Options → General / Fonts & Colors → Link Colors → Unvisited Links" (Firefox 1.0.x) and via "Edit → Preferences → Appearance → Colors / Link Colors → Unvisited Links" in Mozilla Suite and SeaMonkey.
|
| browser. backspace_action
| 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 bug 301248 (Mozilla Suite)
|
| browser. blink_allowed
| Boolean
| True (default): Use of the blink tag or CSS's text-decoration: blink will result in blinking elements.
False: Blinking is disabled.
|
| browser. block. target_new_window
| 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.
|
| browser. bookmarks. added_static_root
| 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.
|
| browser. bookmarks. file
| 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
|
| browser. bookmarks. import_system_favorites
| 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 bug 22642).
|
| browser. bookmarks. livemark_refresh_seconds
| Integer
| The number of seconds between Live Bookmark checks. Values under 60 are assumed to be 60; the default is 3600 (1 hour).
|
| browser. bookmarks. restore_default_bookmarks
| Boolean
| True: Overwrite the current bookmarks.html file with the default set of bookmarks.
False (default): Do not reset bookmarks.
Note: Firefox 1.5 and above only
|
| browser. bookmarks. sort. direction
| 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"
|
| browser. bookmarks. sort. resource
| String
| The RDF source to use when sorting the bookmarks in the Bookmarks Manager
rdf:http://home.netscape.com/NC-rdf#Name (default) - by bookmark name
rdf:http://home.netscape.com/NC-rdf#URL - by URL
rdf:http://home.netscape.com/NC-rdf#ShortcutURL - by bookmark keyword
rdf:http://home.netscape.com/NC-rdf#Description - by description
rdf:http://home.netscape.com/NC-rdf#BookmarkAddDate - by bookmark creation date
rdf:http://home.netscape.com/WEB-rdf#LastModifiedDate - by bookmark modification date
rdf:http://home.netscape.com/WEB-rdf#LastVisitDate - by date of last visit
Note: In Firefox, this can be changed via "Bookmarks → Organize (or Manage) Bookmarks... → View"
|
| browser. cache. check_doc_frequency
| 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)
|
| browser. cache. disk. capacity
| Integer
| Amount of disk space allowed for the browser's cache (in KB). Default is 50000.
Note: In Firefox, this can be changed via "Tools → Options → Advanced → Network / Cache" (Firefox 2) or "Privacy → Cache (Firefox 1.5 and earlier); in Mozilla Suite/SeaMonkey, via "Edit → Preferences → Advanced → Cache".
|
| browser. cache. disk. enable
| 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)
|
| browser. cache. disk. parent_directory
| 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.
|
| browser. cache. disk_cache_ssl
| Boolean
| True: Cache content received via SSL (security risk!)
False (default): Do not cache content received via SSL
Note: See bug 205921 for more information
|
| browser. cache. memory. capacity
| Integer
| Determines how the browser uses RAM for cache.
-1 (default): Automatically set size of capacity as a percentage of physical RAM
0: disables the memory cache device entirely
(n): Set the maximum RAM used to n KB.
|
| browser. cache. memory. enable
| 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 bug 105344)
False: Disable memory cache (same effect as setting browser.cache.memory.capacity to 0)
|
| browser. chrome. favicons
| 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.
|
| browser. chrome. image_icons. max_size
| 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 Location Bar). 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.
|
| browser. chrome. load_toolbar_icons
| 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
|
| browser. chrome. site_icons
| 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.
|
| browser. chrome. toolbar_style
| Integer
| Set toolbar style for browser
0: Pictures Only
1: Text Only
2 (default): Pictures and Text
|
| browser. chrome. toolbar_tips
| 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
|
| browser. chromeURL
| String
| Location of browser's UI chrome; launched at browser startup. Default value is chrome://browser/content/
|
| browser. display. background_color
| String
| The default color for the background of browser content as a hex code. This affects blank tabs, web pages whose backgrounds are not explicity set, and XUL error pages. Default value is #FFFFFF.
Note: In Firefox, this can be changed via "Tools → Options → Content / Fonts & Colors → Colors... → Text and Background → Background " (Firefox 1.5 and above) or "Tools → Options → General → Fonts & Colors (Firefox 1.0.x)"
|
| browser. display. focus_background_color
| 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
|
| browser. display. focus_ring_on_anything
| Boolean
| True: Display the focus ring (normally only shown on links) on anything
False (default): Display the focus ring on links only
|
| browser. display. focus_ring_width
| 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. display. 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. display. 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.
|
| browser. display. 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 "Tools → Options → Content / Fonts & Colors → Colors... → Text and Background → Text" (Firefox 1.5 and above) or "Tools → Options → General → Fonts & Colors (Firefox 1.0.x)"
|
| browser. display. 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
|
| browser. display. screen_resolution
| Integer
| Firefox 1.5 only DPI of display device. Affects CSS absolute length units (e.g. pt, mm).
-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 "Tools → Options → Content → Advanced → Display Resolution". See browser. screen_resolution for Firefox 1.0.x or layout. css. dpi for Firefox 2.0+.
|
| browser. display. show_image_placeholders
| Boolean
| True (default): Show placeholders while image is loading
False: Opposite of above
|
| browser. display. 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 "Tools → Options → Content / Fonts & Colors → Colors → Allow pages to chose their own colors, instead of my selections above" (Firefox 1.5 and above) or "Tools → Options → General → Fonts & Colors → Always use my colors" (Firefox 1.0.x).
|
| browser. display. 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 "Tools → Options → Content / Fonts & Colors → Advanced → Allow pages to chose their own fonts, instead of my selections above" (Firefox 1.5 and above) or "Tools → Options → General → Fonts & Colors → Always use my fonts" (Firefox 1.0.x)
|
| browser. display. use_focus_colors
| Boolean
| True: Set colors on focused items according to preferences
False (default): Do not set colors on focused items
|
| browser. display. 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 "Tools → Options → Content / Fonts & Colors → Colors → Use system colors" (Firefox 1.5 and above) or "Tools → Options → General → Fonts & Colors → Use system colors" (Firefox 1.0.x)
|
| browser. dom. document. all. disabled
| Boolean
| True: Disables emulation of IE's document.all collection
False (default): Enable undetectable document.all support in quirks mode (see bug 248549)
|
| browser. dom. global_scope_pollution. disabled
| Boolean
| True: Disable the more agressive 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.
|
| browser. dom. window. dump. enabled
| Boolean
| True: Enable JavaScript dump() output
False: Opposite of the above
|
| browser. download. 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.
|
| browser. download. dir
| String
| The last directory used for saving a file from the "What should (browser) do with this file?" dialog.
|
| browser. download. downloadDir
| String
| Determines the directory to download to when browser.download.useDownloadDir is false. Appears to mirror browser.download.dir.
|
| browser. download. folderList
| Integer
| Which of several internally-specified locations to use for the default download directory
0 (default): the desktop
1: the downloads folder
2: the last folder specified for a download
Note: In Firefox, this can be changed via "Tools → Options → Main / Downloads → Save files to... (Firefox 2) or Downloads/Download Folder → Save all files to this folder" (Firefox 1.5).
|
| browser. download. 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.
|
| browser. download. lastDir
| String
| Path to the last directory used for a download via "Save As."
|
| browser. download. manager. 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.
|
| browser. download. manager. 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 "Tools → Options → Main / Downloads → Close it when all downloads are finished" (Firefox 2) or Downloads / Download Manager → Close the Download Manager when all downloads are complete" (Firefox 1.5).
|
| browser. download. manager. 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.
|
| browser. download. manager. 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. download. manager. 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).
|
| browser. download. manager. 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 "Tools → Options → Privacy / History → Remember what I've downloaded" (Firefox 2) or "Privacy → Download History → Remove files from the Download Manager" (Firefox 1.5).
|
| browser. download. manager. showAlertInterval
| Integer
| Number of milliseconds after downloads complete to show the "completed" alert. Default value is 2000.
|
| browser. download. manager. 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.
|
| browser. download. manager. 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 "Tools → Options → Main / Downloads → Show the Downloads window when downloading a file" (Firefox 2) or "Tools → Options → Downloads / Download Manager → Show Download Manager when a download begins" (Firefox 1.5)
|
| browser. download. manager. 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
|
| browser. download. 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.
|
| browser. download. 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.
|
| browser. download. 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 "Tools → Options → Main / Downloads → Always ask me where to save files (Firefox 2) 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 "Tools → Options → Advanced → General → Resize large images to fit in the browser window (Firefox 1.0.x and 1.5)". UI removed in Firefox 2.0+.
|
| browser. feedview. articleLength
| Integer
| Pref removed. 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.
|
| browser. feedview. reloadInterval
| Integer
| Pref removed. 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.
|
| browser. feedview. showBar
| Boolean
| Pref removed. 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.
|
| browser. feedview. showImage
| Boolean
| Pref removed. 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.
|
| browser. feedview. showMenu
| Boolean
| Pref removed. 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.
|
| browser. feedview. timerInterval
| Integer
| Pref removed. 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.
|
| browser. feedview. externalCSS
| String
| Pref removed. 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.
|
| browser. fixup. alternate. enabled
| Boolean
| True (default): Try to fix up http://foo to http://(prefix)foo(suffix)
False: Do not second-guess the user
|
| browser. fixup. alternate. 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.
|
| browser. fixup. alternate. suffix
| String
| The suffix to append when attempting to fix an entered URL. Default is ".com". Requires browser.fixup.alternate.enabled be true.
|
| browser. fixup. 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 http://user:password@foo into http://user:password@(prefix)foo(suffix) but instead http://user@(prefix)foo(suffix))
False: Include entered password in fixed URL
|
| browser. formfill. enable
| Boolean
| True (default): Save information entered in web page forms and the Search Bar
False: Opposite of the above
Note: In Firefox, this can be changed via "Tools → Options → Privacy / History → Remember what I enter in forms and the search bar" (Firefox 2) or "Tools → Options → Privacy → Saved Forms → Save information I enter in forms and the Search Bar" (Firefox 1.5)
|
| browser. forms. submit. 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 bug 83065). Eventually this pref may disappear.
|
| browser. frames. enabled
| Boolean
| True (default): Enables the display of HTML frames
False: Opposite of the above; displays <noframes> content instead
|
| browser. goBrowsing. enabled
| Boolean
| True (default): If a normal DNS lookup times out, try hitting Google
False: Opposite of the above
Note: No longer used
|
| browser. helperApps. alwaysAsk. 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. helperApps. neverAsk. openFile
| String
| A comma-separated list of MIME types to open directly without asking for confirmation. Default value is an empty string.
|
| browser. helperApps. neverAsk. 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.
|
| browser. 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. history. grouping
| String
| How to group entries in the history window (not applicable for Firefox's History sidebar). Default value is day.
|
| browser. history_expire_days
| 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 "Tools → Options → Privacy → History → Remember visited pages for the last ___ days". No UI for Firefox 3.
|
| browser. history_expire_days_min
| 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 “Tools → Options → Privacy → History”
|
| browser. history_expire_sites
| Integer
| Maximum number of websites to keep in history. Default value is 40000.
|
| browser. jsannoyances. 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.
|
| browser. link. open_external
| 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 "Tools → Options → Tabs → Open links from other applications in:"; in Firefox 2, via “Tools → Options → Tabs → New pages should be opened in:” (same as browser.link. open_newwindow) and in Seamonkey, via "Edit -> Preferences -> Navigator -> Tabbed browsing / Links from other applications -> Open links passed from another applications in".
|
| browser. link. 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 "Tools → Options → Tabs → Force links that open new windows to open in:"; in Firefox 2, via “Tools → Options → Tabs → New pages should be opened in:” (same as browser.link.open_external) and, in Seamonkey, via "Edit -> Preferences -> Navigator -> Tabbed browsing / Link open behavior -> Open links meant to open a new window in".
|
| browser. link. open_newwindow. restriction
| Integer
| Firefox and SeaMonkey only. Source: The Burning Edge.
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.
|
| browser. link. open_newwindow. ui
| Integer
| Determine which new window open options are available from the UI. No longer used in Firefox 1.0. Default value is 3.
|
| browser. microsummary. enabled
| Boolean
| True (default): Allow the microsummary service to retrieve information for bookmarks with microsummaries.
False: Prevent microsummary updates to bookmarks.
|
| browser. microsummary. generatorUpdateInterval
| 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).
|
| browser. microsummary. requestTimeout
| 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.
|
| browser. microsummary. updateGenerators
| Boolean
| True (default): Periodically check for updates to microsummary generators.
False: Do not update microsummary generators.
|
| browser. microsummary. updateInterval
| 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.
|
| browser. 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"
|
| browser. places. createdDefaultQueries
| 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.
|
| browser. popups. 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.
|
| browser. preferences. advanced. selectedTabIndex
| Integer
| Determines which tab in the Advanced section of the preferences is visible.
0 (default): General
1: Update
2: Security
|
| browser. preferences. 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.
|
| browser. preferences. 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".
|
| browser. preferences. 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 "Tools → Options" you are viewing when you close the dialog.
|
| browser. preferences. privacy. 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. related. 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").
|
| browser. 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").
|
| browser. related. enabled
| Boolean
| Setting for "What's Related"
True (default): Enable
False: Disable
Note: This is not used in Firefox (there is no "What's Related").
|
| browser. related. provider
| String
| The URL to retrieve "What's Related" data from. Default value is http://www-rl.netscape.com/wtgn?
Note: This is not used in Firefox (there is no "What's Related").
|
| browser. safebrowsing. dataProvider
| Integer
| The provider ID of the site used to get the web forgery list. Default value is 0.
Note: This references the pref tree browser.safebrowsing.provider.*
|
| browser. safebrowsing. enabled
| 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 "Tools → Options → Security / Tell me if the site I'm visiting is a suspected forgery".
|
| browser. safebrowsing. provider. *
| 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.
|
| browser. safebrowsing. remoteLookups
| 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 "Tools → Options → 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.
|
| browser. safebrowsing. warning.infoURL
| String
| The FAQ URL for the Safe Browsing feature.
|
| browser. screen_resolution
| Integer
| Firefox 1.0.x only DPI of display device. Affects CSS absolute length units (e.g. pt, mm).
-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 "Tools → Options → General → Fonts & Colors → Display Resolution". See browser. display. screen_resolution for Firefox 1.5.0.x or layout. css. dpi for Firefox 2.0+.
|
| browser. search. basic. min_ver
| String
| Version number used to determine which search engine plugins should be installed/displayed. Default value is 0.0.
|
| browser. search. defaultenginename
| String
| Default search engine plugin to use. Default value is Google.
|
| browser. search. defaulturl
| String
| URL to prepend to search terms. Default value is http://www.google.com/search?lr=&ie=UTF-8&oe=UTF-8&q=
|
| browser. search. log
| Boolean
| True: Log debugging information about the search service to the JavaScript Console and stdout.
False (deault): Do not log debugging information.
Note: Firefox 2.0 and above only.
|
| browser. search. 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.
|
| browser. search. order. (digit)
| String
| (digit) is used to weight the search engine specified by the value for sorting in the list of search engines.
|
| browser. search. order. (name) (. digit)
| String
| Used for weighting search engine entry sorting. Points to .properties file.
|
| browser. search. param. (name). (digit). ("custom" or "default")
| String
| Used for adding arbitrary variables to the search query of the (name) search plugin.
|
| browser. search. selectedEngine
| String
| Name of currently selected search engine plugin
|
| browser. search. selectedEngineInDialog
| String
| Name of currently selected search engine plugin in the search dialog (used when the Search Bar is hidden)
Note: Firefox 1.5 and above only.
|
| browser. search. update
| Boolean
| True (default): Automatically check for updates to search plugins.
False: Opposite of the above.
Note: Firefox 1.5 and above only.
|
| browser. sessionhistory. 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.
|
| browser. sessionhistory. 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.
|
| browser. sessionhistory. max_total_viewers
| 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.
|
| browser. sessionhistory. 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.
|
| browser. shell. checkDefaultBrowser
| Boolean
| Check the system default browser 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 "Tools → Options → Main / System Defaults" (Firefox 2.0 and above) or "Tools → Options → General → Default Browser" (Firefox 1.5 and 1.0.x).
|
| browser. startup. homepage
| String
| URL of homepage, or pipe (|)-separated list of URLs to open in tabs when going to the homepage
Note: In Firefox, this can be changed via "Tools → Options → Main (Firefox 1.5 and 1.0.x: General) → Homepage"
|
| browser. startup. homepage_override. 1
| Boolean
| Stub for browser.startup.homepage_override (used in Netscape 4.x). No longer used. Default value is false.
|
| browser. startup. homepage_override. 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.
|
| browser. startup. 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. startup. page
| Integer
| Page to open on browser startup
0: Blank
1 (default): Home (a.k.a. browser.startup.homepage)
2: Last (probably does not work)
|
| browser. tabs. 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 "Tools → Options → Tabs → Always show the tab bar" (Firefox 2) "Tools → Options → Tabs → Hide the tab bar when only one web site is open (Firefox 1.5) or "Tools → Options → Advanced → Tabbed Browsing → Hide the tab bar when only one web site is open" (Firefox 1.0.x)
|
| Browser. tabs.closeButtons
| Integer
| (Firefox 2.0) 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)
|
| browser. tabs. 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.
|
| browser. tabs. loadBookmarksInBackground
| Boolean
| 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: In Firefox, this can be changed via "Tools → Options → Advanced → Tabbed Browsing → Select New Tabs from Bookmarks or History" (Firefox 1.0.x)
|
| browser. tabs. loadDivertedInBackground
| Boolean
| Determines behavior of pages normally meant to open in a new window (target="_new" 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.
|
| browser. tabs. loadFolderAndReplace
| 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.
|
| browser. tabs. loadGroup
| Integer
| 0: Append group to current tab set
1 (default): Replace current tab set with group
Note: Mozilla Suite/SeaMonkey only.
|
| browser. tabs. loadInBackground
| Boolean
| Focus behavior for new tabs
True (default): Do not focus new tabs opened from links (load in background)
False: Opposite of above
Note: In Firefox, this can be changed via "Tools → Options → Tabs → When I open a link in a new tab, switch to it immediately" (Firefox 2) or "Tools → Options → Tabs → Select new tabs opened from links" (Firefox 1.5) or "Tools → Options → Advanced → Tabbed Browsing → Select new tabs opened from links" (Firefox 1.0.x)
|
| browser. tabs. 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 bug 269664).
|
| browser. tabs. opentabfor. bookmarks
| Boolean
| Controls if a clicked bookmark will open in a new tab when middleclicked.
Note: Pref removed (obsolete). Functionality proposed as enhancement request.
|
| browser. tabs. opentabfor. 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. tabs. opentabfor. searchdialog
| Boolean
| Determines whether to create a new tab for the search results from queries entered in the search dialog (used when the Search Bar is hidden)
Note: Firefox 1.5 and above only.
|
| browser. tabs. opentabfor. urlbar
| Boolean
| Pref removed (unused). 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: Functionality proposed as enhancement request.
|
| browser. tabs. opentabfor. windowopen
| Boolean
| Pref removed (obsolete).
|
| browser. tabs. showSingleWindowModePrefs
| Boolean
| Determines whether to display "Single Window Mode" settings in preferences in Firefox 1.0.x (see bug 266759). Note: Preference is obsolete and has no effect in Firefox 1.5 and above
True: Show "Force links that open in new windows to open in..." options under "Tools → Options → Advanced → Tabbed Browsing" (Firefox 1.0.x)
False (default): Opposite of above
|
| browser. tabs. 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 "Tools → Options → Tabs → Warn (me) when closing multiple tabs" (Firefox 1.5 and above) or "Tools → Options → Advanced → Tabbed Browsing → Warn when closing multiple tabs" (Firefox 1.0.x)
|
| browser. tabs. 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. throbber. url
| String
| Indicates what URL to load when the throbber is clicked. Default value is http://www.mozilla.org/products/firefox/central.html
|
| browser. trim_user_and_password
| Boolean
| Unused
|
| browser. triple_click_selects_paragraph
| 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).
|
| browser. turbo. enabled
| Boolean
| Pref removed (obsolete). 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
|
| browser. underline_anchors
| Boolean
| Determines default text-decoration of anchor elements.
True (default): Underlines links
False: Opposite of above
Note: In Firefox, this can be changed via "Tools → Options → Content → Fonts & Colors → Underline links"
|
| browser. update. 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. urlbar. autoFill
| Boolean
| True: Enables inline autocomplete.
False (default): Opposite of above.
|
| browser. urlbar. 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
|
| browser. urlbar. doubleClickSelectsAll
| Boolean
| True: Select the contents of the address bar when it is double clicked
False(default): Opposite of above
|
| browser. urlbar. filter. javascript
| Boolean
| True (default): Filter out “javascript:” URLs from appearing in the Location Bar autocomplete dropdown.
False: Allow “javascript:” URLs to appear in the dropdown.
|
| browser. urlbar. matchOnlyTyped
| Boolean
| Determines behavior of autocomplete in Location Bar
True: Only matches typing against URLs specifically typed into Location Bar
False (default): Match against history
|
| browser. urlbar. matchOnWordBoundary
| Boolean
| Determines behavior of autocomplete in Location Bar
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.
|
| browser. urlbar. maxRichResults
| Integer
| Determines how many entries should appear (at most) in the dropdown in Location Bar.
|
| browser. visited_color
| String
| The default color for visited links as a hex code. Default is #551A8B
Note: In Firefox, this can be changed via "Tools → Options → Content → Fonts & Colors → Visited Links"
|
| browser. windows. loadOnNewWindow
| 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
|
| browser. xul. error_pages. enabled
| 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.
|
| browser. zoom. full
| Boolean
| True (Default): Full page zoom
False: Text zoom
|
| browser. zoom. siteSpecific
| Boolean
| True (Default): Remember the zoom level on a per-site basis.
False: The zoom level should be applied on the current tab only.
|
content.* allows you to configure the frequency of certain events when parsing and rendering web pages.
These settings affect libeditor (i.e. Composer and Mail). Most have no effect in Firefox.
This branch of preferences is usually used to hold settings for installed extensions, but there are a few that deal with extensions and themes in general.
The (font property) indicates that the value of the entry is one of the following:
layout.* allows you to modify selection behaviour, control spell checking in textareas, modify the appearance of unstyled XML, and change the way pages are layed out.
These fall into two groups, vertical and horizontal scroll. The general form is:
