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://settings/clearBrowserData
chrome://settings/help
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://whats-new
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

about:about Provides an overview of all about: pages available for your current Firefox version
about:addons Add-ons Manager
about:blank Shows a blank page
about:blocked Shows the malware protection page used when the browser identifies a page as not safe for viewing
about:buildconfig Displays the configuration and platform used to build Firefox
about:cache Displays information about the memory, disk, and appcache
about:checkerboard Switches to the checkerboarding measurement page, which allows to detect checkerboarding issues
about:config Provides a way to inspect and change Firefox preferences and settings
about:crashes Lists all crashes, which happened during the runtime of Firefox (in case the user enabled the crash reporter)
about:credits Lists all contributors to the Firefox project
about:debugging Switches to the Developer Tools debugging page, which allows you to debug add-ons, tabs and Service Workers
about:devtools Summarizes the developer tools and provides links to documentation for each tool
about:downloads Displays all downloads done within Firefox
about:home Start page of Firefox when opening a new window
about:license Displays licensing information
about:logo Firefox logo
about:memory Provides a way to display memory usage, save it as report and run the GC and CC
about:mozilla Special page showing a message from "The Book of Mozilla"
about:neterror Shows the error page used when the browser could not access the requested pat
about:networking Displays networking information
about:newtab Start page when opening a new tab
about:performance Displays memory and performance information about Firefox subprocesses/add-ons/tabs
about:plugins Displays information about installed plugins
about:policies Lists out the Firefox for Enterprise policies
about:preferences Firefox settings (also available through Firefox menu > Options)
about:privatebrowsing Start page when opening a private window
about:profiles Display and manage Firefox profiles
about:restartrequired A page users are sent to when Firefox requires a restart due to an update
about:reader Indicates a web page has Firefox Reader View turned on. See Firefox Reader View for clutter-free web pages
about:rights Displays rights information
about:robots Special page showing notes about robots
about:serviceworkers Displays currently running Service Workers
about:studies Lists the Shield Studies that are installed
about:sessionrestore Session restoration (displayed after a Firefox crash)
about:support Troubleshooting information (also available through Firefox menu > ? (question mark) > Troubleshooting Information)
about:sync-log Displays a synchronization protocol related to the Sync feature
about:telemetry Displays telemetry data collected and sent to Mozilla while Firefox is running (in case the user enabled telemetry)
about:url-classifier Displays the status of the URL Classifier services that Firefox uses (for example for Safe Browsing)
about:webrtc Information about WebRTC usage
about:welcome Page first displayed when Firefox is installed
about:welcomeback Information page displayed after Firefox is reset

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!
  • 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.
  • resource:/// Other internal resources. Always loaded in a content process.

Microsoft Edge Beta URIs

edge://settings/peopleProfiles
edge://settings/appearanceAppearance
edge://settings/onStartupOn startup
edge://settings/newTabPageNew tab page
edge://settings/privacyPrivacy and services
edge://settings/contentSite permissions
edge://settings/downloadsDownloads
edge://settings/languagesLanguages
edge://settings/printingPrinting
edge://settings/systemSystem
edge://settings/resetReset settings
edge://settings/helpAbout Microsoft Edge

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

Vivaldi URIs

vivaldi://about
vivaldi://settings
vivaldi://private-intro

CCleaner Browser URIs

secure://about
secure://accessibility
secure://appcache-internals
secure://apps
secure://blob-internals
secure://bluetooth-internals
secure://bookmarks
secure://chrome
secure://components
secure://conflicts
secure://crashes
secure://credits
secure://device-log
secure://devices
secure://dino
secure://discards
secure://download-internals
secure://downloads
secure://extensions
secure://flags
secure://gcm-internals
secure://gpu
secure://help
secure://histograms
secure://history
secure://indexeddb-internals
secure://inspect
secure://interstitials
secure://interventions-internals
secure://invalidations
secure://local-state
secure://management
secure://media-engagement
secure://media-internals
secure://nacl
secure://net-export
secure://net-internals
secure://network-error
secure://network-errors
secure://newtab
secure://ntp-tiles-internals
secure://omnibox
secure://password-manager-internals
secure://policy
secure://predictors
secure://print
secure://process-internals
secure://quota-internals
secure://safe-browsing
secure://secure-urls
secure://security-privacy-center
secure://serviceworker-internals
secure://settings
secure://signin-internals
secure://site-engagement
secure://suggestions
secure://supervised-user-internals
secure://sync-internals
secure://system
secure://terms
secure://thumbnails
secure://tracing
secure://translate-internals
secure://usb-internals
secure://user-actions
secure://version
secure://webrtc-internals
secure://webrtc-logs

For Debug

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

secure://badcastcrash
secure://inducebrowsercrashforrealz
secure://crashdump
secure://kill
secure://hang
secure://shorthang
secure://gpuclean
secure://gpucrash
secure://gpuhang
secure://memory-exhaust
secure://ppapiflashcrash
secure://ppapiflashhang
secure://inducebrowserheapcorruption
secure://heapcorruptioncrash
secure://quit
secure://restart

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