Manage preferences and add-ons

Recommended Extensions program

Learn how extensions make the cut for the Recommended Extensions program and where they can be found.

More information about each permission request you may encounter when installing an extension into Firefox.

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.

Learn about add-on signing and what to do if an extension you want to use could not be verified for use in Firefox.

Extensions, themes and plugins are all types of add-ons for Firefox. This article describes how to disable and remove add-ons in Firefox.

Add-ons have been updated to make Quantum awesome. Here's what's changing for Firefox 57 and beyond.

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.

Learn about the risks of installing extensions from third-parties and how to assess the trustworthiness of the source.

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 have experienced big changes in Firefox 57+ (aka Firefox Quantum). Check out these frequently asked questions for more information.

Discover what constitutes inappropriate content or behavior in an extension or theme, and see how to report any abuse you find.