Firefox enjoys many of the same content-blocking options as Chrome. The following can be found in the regular privacy settings (about:preferences#privacy):

  • cookies / site data;
  • trackers,
  • location tracking,
  • camera and microphone,
  • notifications,
  • popups and autoplay sound All of these include exception lists. The list is strictly practical, and lacks certain important types of content, some long included in Chrome:
  • images,
  • JavaScript,
  • autoplaying video. While fewer users may want to restrict these key site components, the need arises. All can be handled to varying degrees in Firefox’s about:config,


A search for “image” turns up permissions.default.image

  • 1: Allow all images to load (default)
  • 2: Block all
  • 3: Block third-party images (a valuable equivalent to blocking 3rd-party cookies).


Globally, JavaScript can be disabled by changing javascript.enabled to false. The lack of built-in site-by-site settings has been discussed and is mostly addressed with extensions.

Autoplay video

This turns up in the “media” class. Disabling autoplay can involve changing several settings:

  • By default, media.autoplay.default = 0 (allow). Changing to 1 will block and 2 will require user permission.
  • Of course, there’s more to it. If you select 2, set media.autoplay.ask-permission to true to enable the prompts, and media.autoplay.enabled.user-gestures-needed to true to require a click or other “gesture” for a video to start.