This article describes various reasons that would cause an add-on not to be able to be installed and what you can do to fix the issue.
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Here are a few tips for assessing the safety of a third party extension.
More information about each permission request you may encounter when installing an extension into Firefox.
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 how to find out if an extension, theme or hardware acceleration is causing a Firefox problem and what steps you can take to fix it.
More information about each permission request you may encounter when installing an extension into Thunderbird.
Extensions, themes and plugins are all types of add-ons for Firefox. This article describes how to disable and remove add-ons in Firefox.
There are several extensions that you can install to add features to Firefox. Learn how to find, install and manage these add-ons to Firefox for Android.
Firefox for iOS can automatically switch to a dark or light theme to match your device’s settings if you have iOS 13.
This article describes how to uninstall an extension or theme that can't be removed normally.