Firefox’s about: commands

You would have observed Firefox displaying about:blank in the address bar of the browser. These are called the URI‘s. They are special commands which performs some operation. Example : “about:blank” displays a blank page.

These about: commands provide general information about Firefox

about:
Shows information about Firefox.

about:blank
Shows a blank page

about:home
Shows the Firefox home page with a Google search bar.

about:addons
Shows the addons page

about:sync-tabs
Shows tabs synced from other computers (tab syncing has to be enabled).

about:sync-logs
Shows the sync logs

about:credits
Shows credits

about:license
Shows the Mozilla Public License.

about:rights
Shows licensing information and your rights.

about:logo
Shows the logo used on the about: screen.

The following about: commands provide information regarding memory, caches, plugins, configs and settings etc.,

about:plugins
Shows installed, currently enabled plug-ins.

about:buildconfig
Shows the arguments and options used to compile the Firefox build in use.

about:cache
Shows information about the data in the browser cache.

about:cache?device=disk
Shows the disk cache device info, keys, and data.

about:cache?device=memory
Shows the memory cache device info, keys, and data.

about:crashes
Shows details of crashes submitted by Mozilla’s crash reporter.

about:memory
Shows memory usage.

about:config
Shows the firefox configuration page with a lot of configuration options.

about:support
Shows troubleshooting information.

The Following about: commands provide information about private browsing options, sessions etc.,

about:privatebrowsing
Can be used to switch to private browsing mode.

about:sessionrestore
Shows an interface for viewing about last session.

about:blocked
Shows the malware protection page used when the browser identifies a page as not safe for viewing.

about:certerror
Shows the error page used when an SSL/TLS certificate is untrusted or otherwise invalid.

about:feeds
Shows the page used when clicking the rss feed icon in the address bar.

about:neterror
Shows the error page used when the browser could not access the requested path.

New about: commands (added in the recent versions of Firefox)-
about:permissions
This command shows the permissions given by you to different websites, like allowing to store passwords, share your location, allow cookies, open pop-up windows, and maintain offline storage. This was added recently in Firefox 6, so it might not work for you if you are using an older version.

about:about
This is the meta about page – the about page of about pages. It lists all the about page available to you.

about:compartments
Mozilla has added this new command in the latest nightly build of Firefox 13. This page shows a list of all running JS compartments. Compartments are little segments of memory which is used by JavaScripts in Mozilla Firefox.