Free Software Directory:IceCat WebExtensions (proposed)/Resources

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Browser tests

Privacy and security

Merged with "Privacy & Freedom Issues" links found at



Website and WebExtension issues

User resources

AMO users

Mozilla developers

Mozilla security

Add-on hierarchy

By Firefox version:

Add-on positions:

  • Legacy:
    • Firefox 55 and 56 label old add-ons "LEGACY" in in the Add-ons Manager, like the integrated HTML5 Video Everywhere! add-on that ship with these versions.
    • Firefox 57: Tools -> Add-ons -> Legacy Extensions
  • Multiprocess: Multiprocess Firefox (multiprocess) aka Electrolysis (E10s) compatible. Add-on Compatibility Reporter label multiprocess add-ons "Compatible with multiprocess." or "Not compatible with multiprocess." in the Add-ons Manager.

Thunderbird and Seamonkey is not implementing the WebExtension infrastructure. -


  • Are you trying to get in touch with an abandoned add-on? You can message the moderators of IRC channel #amo-editors on the server. This is their policy:
    • The AMO editors need a valid reason from you as they are not allowed to contact developers of add-ons themselves.
    • They also need your e-mail address so that they can share that.
    • You also need to give them permission to share your e-mail address so the person can get in contact with you.

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The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.