More information about each permission request you may encounter when installing an extension into Firefox.
Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.
You can set which Firefox extensions can run in private windows and which can't, when you install the extension or later on. Learn more.
Extend Firefox with add-ons to add new features. Learn about the different types available and how to find and install them.
Extensions, themes and plugins are all types of add-ons for Firefox. This article describes how to disable and remove add-ons in Firefox.
Learn about add-on signing and what to do if an extension you want to use could not be verified for use in Firefox.
Learn how extensions make the cut for the Recommended Extensions program and where they can be found.
A theme is a type of add-on which changes the visual appearance of Firefox. Learn how to find, install, and manage themes in Firefox.
Add-ons have been updated to a new standard in Firefox version 57 and above. Learn more about this change in Firefox extensions.
Add-ons have undergone big changes in Firefox 57 and above. This article answers frequently asked questions about changes to extensions.
Discover what constitutes inappropriate content or behavior in an extension or theme, and see how to report any abuse you find.
Mozilla ended official support of the Lightbeam extension in October 2019 and has no plans to resume maintenance of it in the future.
Extensions removed in October 2019.
Add-ons can cause issues in Firefox. This article provides more information on how you can troubleshoot Firefox issues related to add-ons.