Information and config URLs

• about:config
  • Configuration panel, configuration is done by updating key value pairs
• about:support
  • Shows the list of Firefox and associated components information
• about:performance
  • Performance by tab
• about:memory
  • Panel to measure and get the memory information
• about:serviceworkers
  • Shows the list of registered service workers and let us unregister them
• about:buildconfig
  • Shows the Build flags and other configuration used for building the Firefox binary
• about:plugins
  • Shows the list of plugins
• about:profiles
  • List of Firefox profiles and options to create/delete/rename the profile

GPU

• Hardware video acceleration
  • media.ffmpeg.vaapi.enabled -> true
  • media.rdd-vpx.enabled -> true
• https://fedoraproject.org/wiki/Firefox_Hardware_acceleration

Customization

• https://github.com/MrOtherGuy/firefox-csshacks
• https://www.userchrome.org
• https://superuser.com/questions/1568072/hide-navigation-bar-in-firefox