Preferential 
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Available Documentation
- FAQ
- Documented Preferences
- Anyone wishing to contribute documentation is encouraged to contact GuruJ.
Documented Preferences
Last Updated: 2006-10-24
This page contains an extensive list of Mozilla preferences, and is a HTML conversion of the information contained in the Preferential extension. While it is not complete, it is one of the most comprehensive resources available on the Internet. Please e-mail GuruJ@mbox.com.au with any new preference descriptions or errata. This list applies to Mozilla Suite, Mozilla Firebird, Mozilla Thunderbird, other derivatives and all related extensions!
NB: All references to FOO or BAR are wildcards. Replace this with the number or text of your choice here (exactly which depends on the context) and Mozilla should pick up all preferences that match this pattern.
accessibility.accesskeycausesactivation
Pressing access key follows link, instead of just highlighting it?
Pressing access key follows link, instead of just highlighting it?
accessibility.browsewithcaret
Browse web pages using caret (cursor)?
Browse web pages using caret (cursor)?
accessibility.disablecache
** purpose not known - please advise by mailing GuruJ@mbox.com.au **
** purpose not known - please advise by mailing GuruJ@mbox.com.au **
accessibility.disableenumvariant
** purpose not known - please advise by mailing GuruJ@mbox.com.au **
** purpose not known - please advise by mailing GuruJ@mbox.com.au **
accessibility.tabfocus
Determines which web page elements can gain focus when TAB key is pressed
Determines which web page elements can gain focus when TAB key is pressed
- 1 : Text field form controls only
- 2 : All form controls except text fields
- 3 : All form controls
- 4 : Hyperlinks and hyperlinked images
- 7 : All form controls and hyperlinks
accessibility.typeaheadfind
Enables type-ahead find (see http://www.mozilla.org/projects/ui/accessibility/typeaheadfind.html)
Enables type-ahead find (see http://www.mozilla.org/projects/ui/accessibility/typeaheadfind.html)
accessibility.typeaheadfind.autostart
Start type-ahead find without having to press / (find text) or ' (find links) first?
Start type-ahead find without having to press / (find text) or ' (find links) first?
accessibility.typeaheadfind.enablesound
Enable error sound for type-ahead find? (Currently off by default for Linux/Unix, on by default for other platforms)
Enable error sound for type-ahead find? (Currently off by default for Linux/Unix, on by default for other platforms)
accessibility.typeaheadfind.enabletimeout
Enable error sound for type-ahead find? (Currently off by default for Linux/Unix, on by default for other platforms)
Enable error sound for type-ahead find? (Currently off by default for Linux/Unix, on by default for other platforms)
accessibility.typeaheadfind.linksonly
Only allow type-ahead find for links?
Only allow type-ahead find for links?
accessibility.typeaheadfind.soundURL
Specify filename (.wav) for the error sound, or use "default" for default sound or "beep" for system beep
Specify filename (.wav) for the error sound, or use "default" for default sound or "beep" for system beep
- default : Default sound
- beep : System beep
accessibility.typeaheadfind.startlinksonly
Only match on the start of links?
Only match on the start of links?
accessibility.typeaheadfind.timeout
Time (in ms) before type-ahead find automatically deactivates
Time (in ms) before type-ahead find automatically deactivates
accessibility.usebrailledisplay
Enter command-line for the braille display program to use with Mozilla (blank for none)
Enter command-line for the braille display program to use with Mozilla (blank for none)
accessibility.usetexttospeech
Enter command-line for the text-to-speech program to use with Mozilla (blank for none)
Enter command-line for the text-to-speech program to use with Mozilla (blank for none)
accessibility.warn_on_browsewithcaret
Warn user before turning on caret browsing?
Warn user before turning on caret browsing?
addressbook.throbber.url
URL addressbook points to when clicked
URL addressbook points to when clicked
advanced.always_load_images
Always load all images when visiting a web page?
Always load all images when visiting a web page?
advanced.mailftp
Send user's email address as password for anonymous FTP?
Send user's email address as password for anonymous FTP?
advanced.system.supportDDEExec
(Windows only) Support execution of DDE commands? In some cases, setting this to false may allow external links to open in a new window (see bug 155402 comment 10 - see also browser.always_reuse_window).
(Windows only) Support execution of DDE commands? In some cases, setting this to false may allow external links to open in a new window (see bug 155402 comment 10 - see also browser.always_reuse_window).
aim.session.screenname
AIM user handle
AIM user handle
alerts.height
Height of alert box
Height of alert box
alerts.slideIncrement
Amount to 'slide' by
Amount to 'slide' by
alerts.slideIncrementTime
Time (in ms) taken to perform a slide
Time (in ms) taken to perform a slide
alerts.totalOpenTime
Total time (in ms) that alert remains open
Total time (in ms) that alert remains open
application.use_ns_plugin_finder
Use Netscape plug-in finder?
Use Netscape plug-in finder?
autoadmin.append_emailaddr
Automatically append received e-mail addresses to address book?
Automatically append received e-mail addresses to address book?
autoadmin.failover_to_cached
Automatically load cached web page if 'live' one cannot be located?
Automatically load cached web page if 'live' one cannot be located?
autoadmin.global_config_url
URL from which to retrieve all configuration settings
URL from which to retrieve all configuration settings
autoadmin.offline_failover
Automatically change to offline browsing if online browsing fails?
Automatically change to offline browsing if online browsing fails?
autoadmin.refresh_interval
Time in minutes between fetching the configuration file specified in autoadmin.global_config_url
Time in minutes between fetching the configuration file specified in autoadmin.global_config_url
autocomplete.grab_during_popup
(X11 only) Specify if the autocomplete pop-up control should grab the keyboard. This option can be set to false to work around the bug where XKB does not set mode switching properly.
The default value is true.
Setting this preference dynamically takes effect in the next autocomplete session.
See also: autocomplete.ungrab_during_mode_switch
(X11 only) Specify if the autocomplete pop-up control should grab the keyboard. This option can be set to false to work around the bug where XKB does not set mode switching properly.
The default value is true.
Setting this preference dynamically takes effect in the next autocomplete session.
See also: autocomplete.ungrab_during_mode_switch
autocomplete.ungrab_during_mode_switch
(X11 only) This option complements autocomplete.grab_during_popup. If both preferences are true, then during an autocomplete session the application will release/grab keyboard when a mode-switch key is pressed/released.
If either of these two preferences is false, then the application will not release keyboard grab during an autocomplete session.
The default value is true.
Setting this preference dynamically takes effect in the next autocomplete session.
See also: autocomplete.grab_during_popup
(X11 only) This option complements autocomplete.grab_during_popup. If both preferences are true, then during an autocomplete session the application will release/grab keyboard when a mode-switch key is pressed/released.
If either of these two preferences is false, then the application will not release keyboard grab during an autocomplete session.
The default value is true.
Setting this preference dynamically takes effect in the next autocomplete session.
See also: autocomplete.grab_during_popup
autoupdate.enabled
Use Autoupdate?
Use Autoupdate?
backups.number_of_prefs_copies
Number of copies to make of the preference file
Number of copies to make of the preference file
bidi.characterset
How browser determines character set to use
How browser determines character set to use
- 1 : Document-specified character set
- 2 : Default character set
bidi.clipboardtextmode
Type of clipboard to use
Type of clipboard to use
- 1 : Logical
- 2 : Visual
- 3 : Source
bidi.controlstextmode
How controls are used
How controls are used
- 1 : Logical
- 2 : Visual
- 3 : Container
bidi.direction
Select direction of text
Select direction of text
- 1 : Left-to-right
- 2 : Right-to-left
bidi.numeral
How numerals are displayed
How numerals are displayed
- 1 : Regular context numerals
- 2 : Hindi context numerals
- 3 : Arabic numerals
- 4 : Hindi numerals
bidi.support
Select provider of bi-directional support
Select provider of bi-directional support
- 1 : Mozilla
- 2 : OS
- 3 : Disable
bidi.texttype
Type of text
Type of text
- 1 : Charset
- 2 : Logical
- 3 : Visual
browser.PICS.disable_for_this_session
Turn off PICS until next session?
Turn off PICS until next session?
browser.PICS.pages_must_be_rated
Only allow viewing of PICS-rated pages?
Only allow viewing of PICS-rated pages?
browser.PICS.ratings_enabled
Enables PICS ratings?
Enables PICS ratings?
browser.PICS.reenable_for_this_session
Turn PICS back on for the remainer of this session?
Turn PICS back on for the remainer of this session?
browser.PICS.service.http___home_netscape_com_default_rating.s
Internal PICS rating, do not alter.
Internal PICS rating, do not alter.
browser.PICS.service.http___home_netscape_com_default_rating.service_enabled
Internal PICS rating service page, do not alter.
Internal PICS rating service page, do not alter.
browser.allowpopups
Allow unrequested popups in browser?
Allow unrequested popups in browser?
browser.always_reuse_window
Always reuse existing Mozilla windows when OS requests opening of a URL?
Always reuse existing Mozilla windows when OS requests opening of a URL?
browser.anchor_color
Default color of hyperlinks (#RRGGBB)
Default color of hyperlinks (#RRGGBB)
browser.blink_allowed
Allow use of <BLINK> tag?
Allow use of <BLINK> tag?
browser.block.target_new_window
Prevent hyperlinks from opening new windows?
Prevent hyperlinks from opening new windows?
browser.bookmarks.added_static_root
Has Mozilla already imported the system bookmarks? (This will only happen once for each profile.)
Has Mozilla already imported the system bookmarks? (This will only happen once for each profile.)
browser.bookmarks.confirm_sorting
Enable the bookmark sorting confirmation prompt?
Enable the bookmark sorting confirmation prompt?
browser.bookmarks.import_system_favourites
Import system (usually IE) URL favourites into Mozilla?
Import system (usually IE) URL favourites into Mozilla?
browser.cache.check_doc_frequency
Set how often to check accuracy of cached documents
Set how often to check accuracy of cached documents
- 0 : Once per session
- 1 : Each time
- 2 : Never
- 3 : When appropriate/automatically
browser.cache.disk.capacity
Size of disk cache (in KB)
Size of disk cache (in KB)
browser.cache.disk.enable
Use disk cache?
Use disk cache?
browser.cache.disk.parent_directory
Directory in which to store cache files
Directory in which to store cache files
browser.cache.disk_cache_ssl
Cache documents retrieved via HTTPS/SSL?
Cache documents retrieved via HTTPS/SSL?
browser.cache.enable
Enable caching of documents retrieved by browser?
Enable caching of documents retrieved by browser?
browser.cache.memory.capacity
Size of memory cache (in KB)
Size of memory cache (in KB)
browser.cache.memory.enable
Use memory cache?
Use memory cache?
browser.chrome.favicons
Display 'favourite icons' in location bar?
Display 'favourite icons' in location bar?
browser.chrome.load_toolbar_icons
Sets behavior when loading toolbar icons
Sets behavior when loading toolbar icons
- 0 : Never load (default)
- 1 : Load cached icons only
- 2 : Always load
browser.chrome.site_icons
Display 'favourite icons' in Bookmarks?
Display 'favourite icons' in Bookmarks?
browser.chrome.toolbar_tips
Show tooltips for toolbars and bookmarks, displaying the bookmark name and URL?
Show tooltips for toolbars and bookmarks, displaying the bookmark name and URL?
browser.chrome.toolbar_style
Set toolbar style for browser
Set toolbar style for browser
- 0 : Pictures Only
- 1 : Text Only
- 2 : Pictures and Text (default)
browser.chromeURL
Specifies URL used to launch browser XUL
Specifies URL used to launch browser XUL
browser.display.background_color
Set default browser background color (#RRGGBB)
Set default browser background color (#RRGGBB)
browser.display.base_font_scaler
Set to an integer value to scale base font sizes on websites which do not override defaults (eg. via CSS).
Set to an integer value to scale base font sizes on websites which do not override defaults (eg. via CSS).
browser.display.focus_background_color
Set background color for focussed text (eg. for type-ahead find)
Set background color for focussed text (eg. for type-ahead find)
browser.display.focus_ring_on_anything
Draw a dotted focus ring around objects when selected?
Draw a dotted focus ring around objects when selected?
browser.display.focus_ring_width
Set width (in pixels) of the dotted focus ring?
Set width (in pixels) of the dotted focus ring?
browser.display.focus_text_color
Set foreground color for focussed text (#RRGGBB)
Set foreground color for focussed text (#RRGGBB)
browser.display.force_inline_alttext
Force display of ALT text inline with browser text?
Force display of ALT text inline with browser text?
browser.display.foreground_color
Set default browser foreground color (#RRGGBB)
Set default browser foreground color (#RRGGBB)
browser.display.internaluse.graphics_changed
RESERVED: for internal use only
RESERVED: for internal use only
browser.display.normal_lineheight_calc_control
Used to ensure CSS lineheight calculated correctly (unsure?)
Used to ensure CSS lineheight calculated correctly (unsure?)
browser.display.screen_resolution
Screen resolution (in DPI)
Screen resolution (in DPI)
browser.display.show_image_placeholders
Show image placeholders while images are loading/broken?
Show image placeholders while images are loading/broken?
browser.display.use_document_colors
Allow current document to specify colors to use? (If false, background images will also not be loaded)
Allow current document to specify colors to use? (If false, background images will also not be loaded)
browser.display.use_document_fonts
Allow current document to specify fonts to use?
Allow current document to specify fonts to use?
browser.display.use_focus_colors
Use focus colors specified by Windows?
Use focus colors specified by Windows?
browser.display.use_system_colors
Automatically choose system colors for foreground and background?
Automatically choose system colors for foreground and background?
browser.display_very_small_fonts
Enable display of very small fonts in browser?
Enable display of very small fonts in browser?
browser.dom.window.dump.enabled
Allow dump of DOM window?
Allow dump of DOM window?
browser.download.dir
Last directory selected for downloading files
Last directory selected for downloading files
browser.download.progressDnldDialog.enable_launch_reveal_buttons
Enable 'Launch' and 'Show File Location' buttons when download completes?
Enable 'Launch' and 'Show File Location' buttons when download completes?
browser.download.progressDnldDialog.keepAlive
Keep download progress dialog open after download is complete
Keep download progress dialog open after download is complete
browser.download.progressDnlgDialog.dontAskForLaunch
Don't ask for confirmation on launching a file from download dialog every time
Don't ask for confirmation on launching a file from download dialog every time
browser.download.save_converter_index
Choose how webpages are saved (Default=0)
Choose how webpages are saved (Default=0)
- 0 : Web Page (Complete)
- 1 : Web Page (HTML only)
- 2 : Text
browser.downloadmanager.behavior
Set how download manager operates
Set how download manager operates
- 0 : Open the download manager
- 1 : Open a progress dialog
- 2 : Don't open anything
browser.drag_out_of_frame_style
Change how selecting text is handled when your mouse is outside of the text's bounding box.
Change how selecting text is handled when your mouse is outside of the text's bounding box.
- 0 : (Default) Select normally
- 1 : Jump to beginning/end
browser.editor.disabled
Should the 'Edit Page' option appear?
Should the 'Edit Page' option appear?
browser.enable_automatic_image_resizing
Enable automatic image scaling if too big for the screen
Enable automatic image scaling if too big for the screen
browser.fixup.alternate.enabled
Enable the use of alternate URLs?
Enable the use of alternate URLs?
browser.fixup.alternate.prefix
Text to put before the URL domain name
Text to put before the URL domain name
browser.fixup.alternate.suffix
Text to put after the URL domain name
Text to put after the URL domain name
browser.forms.submit.backwards_compatible
Use backwards compatible method of submitting forms?
Use backwards compatible method of submitting forms?
browser.frame.validate_origin
Validate origin of frames before allowing display?
Validate origin of frames before allowing display?
browser.frames.enabled
Enable display of frames on this browser?
Enable display of frames on this browser?
browser.goBrowsing.enabled
Display 'Go' button in browser?
Display 'Go' button in browser?
browser.helperApps.alwaysAsk.force
Force browser to always ask user what they want to do?
Force browser to always ask user what they want to do?
browser.helperApps.neverAsk.openFile
Set MIME types which browser will always open automatically
Set MIME types which browser will always open automatically
browser.helperApps.neverAsk.saveToDisk
Set MIME types which browser will always save to disk
Set MIME types which browser will always save to disk
browser.history.grouping
Set how history URLs are grouped
Set how history URLs are grouped