This is a list of “about” pages for your convenience.
Some of them might be confusing. Some are for diagnostic purposes only.
And some are omitted because they require query strings.
Mozilla-specific about: URIs
Many of these can also be used in Thunderbird, by setting them as the "Mail Start Page". Also, some extensions define additional about: URIs not listed here.
|URIs||Mozilla Application Suite / SeaMonkey||Mozilla Firefox|
|about:addons||Shows installed addons, plugins, themes, and provides an interface for installing new addons. Firefox 4+, SeaMonkey 2.1+|
|about:app-manager||Shows the Firefox OS Simulator.|
|about:bloat||Displays BloatView output (disabled in release builds). Superseded by about:memory on Gecko 1.9.2.|
|about:blocked||Shows the malware protection page used when the browser identifies a page as not safe for viewing. Firefox 3+|
|about:buildconfig||Shows the arguments and options used to compile the build in use.|
|about:cache||Shows information about the Cache Service. Number of entries, location of cache, size of cache, etc. for both memory and disk cache.|
|about:cache?device=memory||Shows individual entries in memory.|
|about:cache?device=disk||Shows individual entries on disk.|
|about:cache?device=offline||Shows individual entries for offline viewing. Gecko 1.9+|
|about:cache-entry||Shows information about a cache entry. Used in about:cache links. Requires parameters.|
|about:certerror||Shows the error page used when an SSL/TLS certificate is untrusted or otherwise invalid.|
|about:config||Shows an interface for viewing and setting a wide variety of configuration variables, many of which are not otherwise accessible through the GUI (options panels). It displays a message which tells the user that the settings might void the warranty and they can be "Harmful to the stability, security, and performance of this application." The message about voiding one's warranty is a joke, as Mozilla Firefox ships without a warranty of any kind.|
|about:crashes||Shows details of crashes submitted by Mozilla's crash reporter. Firefox 3+, SeaMonkey 2.0+|
|about:credits||Shows a list of all those who contributed to Mozilla.|
|about:downloads||Shows a list of downloaded files.|
|about:feeds||Shows the page used when clicking the rss feed icon in the address bar.|
|about:healthreport||Shows the Firefox Health Report.|
|about:home||Shows the Firefox 4 default home page.|
|about:jetpack||Shows an interface for viewing and setting the JetPack extension.|
|about:kitchensink||Was never included in Mozilla for the reasons listed in bug 122411 ("Mozilla does not have a kitchen sink"). A Firefox extension that adds it can be installed. (In SeaMonkey, the above-mentioned XML page would need to be bookmarked, copied, or SeaMonkey added to the extension's
|about:licence||In the British English localised version, shows the content of about:license but with all occurrences of license used as a noun replaced with licence (see American and British English spelling differences). Not available in Firefox 4|
|about:license||Shows the Mozilla Public License (and the Netscape Public License) for the piece of software. Gecko 1.8+|
|about:logo||Shows the logo used on the about: screen.|
|about:memory||Shows memory usage. Firefox 3.6+|
|about:mozilla||Easter egg, shows a verse from The Book of Mozilla.|
|about:neterror||Shows the error page used when the browser could not access the requested path.|
|about:newaddon||This dialog is shown when one or more add-ons have been added without using the normal Add-on Manager procedures, by dropping it in one of the "special" add-on directories. It asks which ones to keep enabled.
|about:newtab||Shows a grid of favourite and most-visited websites, Firefox 13+.|
|about:permissions||Shows permissions for all sites on Firefox 6.0a1.|
|about:plugins||Shows installed, currently enabled plug-ins.|
|about:preferences||Shows the new preferences page.|
|about:privatebrowsing||Can be used to switch to private browsing mode. It shows a message indicating that Firefox will not remember any history for the current session. Note: It does not show URI on the address bar.|
|about:rights||Shows licensing information.|
|about:robots||Easter egg, beginning with March 8, 2008 trunk builds. The title of a window contains a citation from The Day the Earth Stood Still.|
|about:sessionrestore||Shows an interface for viewing about last session.|
|about:startpage||In Ubuntu, shows the Ubuntu start page with the current search engine (if the addon Ubuntu Firefox Modifications – ubufox is installed).|
|about:support||Shows troubleshooting information. Firefox 3.6+, SeaMonkey 2.1+|
|about:sync-tabs||Shows list of tabs from other computers. Requires enabled synchronization.|
|about:tabcrashed||TBA. Firefox 25+|
|about:webrtc||Shows an interface for WebRTC internals.|
Reset Firefox to its default state
- At the top of the Firefox window, click the Firefox button, go over to the Help sub-menu and select Troubleshooting Information.
- Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.
- To continue, click Reset Firefox in the confirmation window that opens.
- Firefox will close and be reset. When it's done, a window will list the information that was imported. Click Finish and Firefox will open.
Clear Firefox Browser Cache
Clear the cache
- Click the menu button and choose Options
- Select the Advanced panel.
- Click on the Network tab.
- In the Cached Web Content section, click Clear Now.
- Click OK to close the Options window
Firefox Profile Folder
1: Click on menu bar Help
2: Select Troubleshooting Information. The about:support page will open.
3: In Application Basics click Show Folder