Diverse

Diverse

Browser URI info

about: URIs that are known to be defined for specific purposes

about:blankReturns a blank HTML document with the media type text/html and character encoding UTF-8. This is widely used to load blank pages into browsing contexts, such as iframes within HTML, which may then be modified by scripts.
about:legacy-compatA reserved, though unresolvable, URI defined within HTML5 intended for use in the DOCTYPE designed for compatibility with some legacy authoring tools, such as XSLT, which may not be capable of outputting the more common, shorter alternative that lacks both the PUBLIC and SYSTEM identifiers. <!DOCTYPE html SYSTEM "about:legacy-compat">.
about:srcdocA reserved, though unresolvable, URI defined within HTML5 intended to be the URI navigated to within iframes whose content comes from the srcdoc attribute.
about:invalidA reserved, though unresolvable, URI defined within CSS Values and Units module, intended as a non-existent document with a generic error condition for use where a URI is necessary, but where no actual resource is desired.

Common about: URIs

about:
about:about
about:blank
about:plugins
about:cache

Google Chrome URIs

Google Chrome-specific about: URIs

about:cacheShows the content of the cache
about:crashCrashes the current rendering process. (This causes the “Aw, snap!” crash notification page to be displayed.)
about:creditsDisplays the list of free and open source software used in the browser, and their associated licences.
about:dnsDisplays the DNS records
about:flagsSee about:labs
about:gpuDisplays information about WebGL and hardware accelerated graphics.
about:histogramsDisplays histograms
about:inducebrowsercrashforrealzCrashes the Google Chrome browser. This is designed for developers to test what happens when the Google Chrome browser crashes.
about:internetsOn particular versions of Windows, displays a page entitled “Don't Clog the Tubes!” which renders a page with an animation of the Microsoft Windows “3D Pipes” screensaver. Does not work on Windows Vista due to the pipes screen saver no longer being supported for releases after the 2.0.169.1 release.
about:killSame as about:crash, but with a violet background color and the message “He's Dead, Jim!” Occurs when the OS runs out of memory or the browser is killed by an external cause, such as the OS shutting down.
about:labsDisplays a page for testing features. Moved to about:flags in Chrome Dev channel 8.0.552.11
about:memoryDisplays the process manager
about:net-internalsProvides an interface for monitoring the network usage and performance statistics
about:pluginsShows installed plug-ins
about:shorthangHangs the tab's process, making it become unresponsive. This is designed for testing the hanging protection
about:statsDisplays statistics about processes. At the top of the page, it states “Shhh! This page is secret!”
about:versionDisplays version information, same as about:

Google Chrome URIs (2)

chrome://about
chrome://accessibility
chrome://appcache-internals
chrome://apps
chrome://blob-internals
chrome://bluetooth-internals
chrome://bookmarks
chrome://cache
chrome://chrome
chrome://chrome-urls
chrome://components
chrome://conflicts
chrome://crashes
chrome://credits
chrome://device-log
chrome://devices
chrome://dino
chrome://discards
chrome://dns
chrome://downloads
chrome://extensions
chrome://flags
chrome://flash
chrome://gcm-internals
chrome://gpu
chrome://help
chrome://histograms
chrome://history
chrome://indexeddb-internals
chrome://inspect
chrome://invalidations
chrome://local-state
chrome://media-internals
chrome://nacl
chrome://net-export
chrome://net-internals
chrome://network-error
chrome://network-errors
chrome://newtab
chrome://ntp-tiles-internals
chrome://omnibox
chrome://password-manager-internals
chrome://policy
chrome://predictors
chrome://print
chrome://profiler
chrome://quota-internals
chrome://serviceworker-internals
chrome://settings
chrome://signin-internals
chrome://site-engagement
chrome://suggestions
chrome://supervised-user-internals
chrome://sync-internals
chrome://system
chrome://taskscheduler-internals
chrome://terms
chrome://thumbnails
chrome://tracing
chrome://translate-internals
chrome://usb-internals
chrome://user-actions
chrome://version
chrome://view-http-cache
chrome://webrtc-internals
chrome://webrtc-logs

For Debug

The following pages are for debugging purposes only. They crash or hang the renderer.

chrome://badcastcrash/
chrome://crash/
chrome://crashdump/
chrome://kill/
chrome://hang/
chrome://shorthang/
chrome://gpuclean/
chrome://gpucrash/
chrome://gpuhang/
chrome://memory-exhaust/
chrome://ppapiflashcrash/
chrome://ppapiflashhang/
chrome://quit/
chrome://restart/

Info about Google Chrome URIs

Also, please note that all of the commands mentioned above can also be called using Google Chrome about command, which redirects to chrome://.

For example, both of the following are exactly the same.

about:history
chrome://history

Firefox URIs

That's not actually a command, it's a URI scheme. Firefox understands a number of URI schemes and they have various uses:
  • about: Special pages (see about:about for a partial list)
  • chrome: Internal UI components, including localisable text and customisable appearance
  • data: Used to simulate files. For instance, you could use data:text/plain,Hello! to simulate the effect of a file containing the string Hello!
  • feed: Used to refer to Atom or RSS feeds
  • file: Used to refer to local files (only works from other files obviously)
  • ftp: Used to download from FTP sites
  • http: Used to refer to websites (obviously)
  • https: Used to refer to secure sites
  • jar: Used to extract entries from within ZIP files (jar:!/path/to/entry)
  • javascript: Used to execute Javascript (obsoleted by onclick handler) moz-icon: Used by the UI to refer to icons for files or file types
  • resource: Other internal resources
  • view-source: Used to show the source of a page (view-source:URI)
about:Shows information about Firefox
about:about
about:addonsShows the addons page
about:blankShows a blank page
about:blockedShows the malware protection page used when the browser identifies a page as not safe for viewing
about:buildconfigShows the arguments and options used to compile the Firefox build in use
about:cacheShows information about the data in the browser cache
about:cache?device=diskShows the disk cache device info, keys, and data
about:cache?device=memoryShows the memory cache device info, keys, and data
about:certerrorShows the error page used when an SSL/TLS certificate is untrusted or otherwise invalid
about:compartments
about:configShows the firefox configuration page with a lot of configuration options
about:crashesShows details of crashes submitted by Mozilla's crash reporter
about:creditsShows credits
about:downloads
about:feedsShows the page used when clicking the rss feed icon in the address bar
about:healthreport
about:homeShows the Firefox home page with a Google search bar
about:licenseShows the Mozilla Public License
about:logoShows the logo used on the about: screen
about:memoryShows memory usage
about:mozilla
about:neterrorShows the error page used when the browser could not access the requested path
about:newtab
about:permissions
about:pluginsShows installed, currently enabled plug-ins
about:preferences
about:privatebrowsingCan be used to switch to private browsing mode
about:rights
about:robots
about:sessionrestoreShows an interface for viewing about last session
about:supportShows troubleshooting information
about:sync-logShows the sync logs
about:sync-progress
about:sync-tabsShows tabs synced from other computers (tab syncing has to be enabled)
about:telemetry
about:welcomeback

Internet Explorer URIs

Internet Explorer-specific about: URIs

about:homeDisplays the user's home page. Not supported in Internet Explorer 8 and later
about:blankDisplays the blank page
about:desktopitemnavigationfailureDisplays “navigation cancelled” page
about:navigationcanceledDisplays “navigation cancelled” page
about:navigationfailureDisplays “navigation cancelled” page
about:noadd-onsDisplays information page when add-ons are disabled
about:noadd-onsinfoDisplays information page about the effects when you use add-ons
about:offlineinformationInforms the user that the current page can not be viewed off line
about:postnotcachedInforms the user that to refresh the current page, information entered in a form will have to be re-posted
about:securityriskInforms the user not to browse with the current security settings because they may be harmful to the computer
about:tabsInforms the user about tabbed browsing. It is also loaded when a new tab is created if the “Open home page for new tabs instead of a blank page” setting is enabled
about:inprivateInforms the user about InPrivate Browsing. It is loaded when InPrivate Browsing is initiated

Opera URIs

Opera-specific about: URIs

opera://blankMaps to about:blank
opera://aboutProvides info about the browser and the configured paths
about://operaMaps to opera:about
opera://cacheShows the content of the cache
opera://config(Opera 9.0 and newer) Shows a page that allows changing of numerous browser preferences, many of which cannot be accessed through the normal Preferences window
opera://drives(Operating system specific) Shows the local drives of the host system
opera://historyShows the content of the browser history
opera://historysearch(Opera 9.5 and newer) Shows the start page of internal search engine for the browser history
opera://pluginsShows installed plug-ins. Opera 11 and newer allow you to disable individual plug-ins from this page
opera://buttonDefines a custom button as a set of Opera actions. (Note: This does not work directly, you need to specify all button parameters as on CustomButtons.)
opera://helpShortcut to the help directory. This can be either local or external
opera://debug(Opera 9.5 and newer) Shows a page that allows changing of settings for remote debug of Opera via Opera Dragonfly
opera://memdebug(Opera 9.5 and newer) Shows debug information about memory usage
opera://webstorage(Opera 10.5 and newer) Shows information Web Storage (see HTML5)
opera://webdatabases(Opera 10.5 and newer) Shows information Web Storage databases (see HTML5)
opera://gpuShows information about hardware accelerated graphics and GPU support
opera://cpu(Introduced in Opera 12 beta). Displays CPU usage
opera://settingsShows the Opera settings page

Info about Opera URIs

Also, please note that all of the commands mentioned above can also be called using Opera about command, which redirects to opera://.

For example, both of the following are exactly the same.

about:history
opera://history

Sources:

http://techmeasy.blogspot.com/2011/07/firefoxs-about-commands-and-easter-eggs.html
http://en.wikipedia.org/wiki/About%3a_URI_scheme#Common_about%3a_addresses