Firefox and the "about" protocol

There is a lot of useful information about Firefox hidden away behind the about: URL protocol. The most useful is the URL about:config, which displays preferences and settings that can be inspected and changed. Here is a complete list of URLs in the about: pseudo protocol:
about: page     Description
about:     Displays version and build information and links to the contributors, licensing information and build configuration
about:about     Provides an overview of all about: pages
about:accounts     Page used by the Sync feature
about:addons     Add-ons Manager
about:app-manager     App Manager
about:buildconfig     Displays the configuration and platform used to build Firefox
about:cache     Displays information about the memory, disk, and appcache
about:compartments     Displayed information about compartments; since Firefox 26, that information can be found in the “Other Measurements” section of about:memory.
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:customizing     Switches to the customization page, which allows to customize Firefox’ UI
about:downloads     Displays all downloads done within Firefox
about:healthreport     Displays performance information of Firefox (in case the user enabled the health report)
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:networking     Displays networking information
about:newtab     Start page when opening a new tab
about:permissions     Provides a way to display and manage website permissions.  Removed in Firefox 45 (bug 933917)
about:plugins     Displays information about installed plugins
about:preferences     Firefox settings (also available through Firefox menu > Options)
about:privatebrowsing     Start page when opening a private window
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: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:sync-progress     Page displayed after the Sync feature got set up
about:sync-tabs     Lists tabs available for synchronization 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:webrtc     Information about WebRTC usage
about:welcomeback     Information page displayed after Firefox is reset

source:https://developer.mozilla.org/en-US/Firefox/The_about_protocol

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