Add-ons let you add bells & whistles to Firefox. You can get add-ons that compare prices, check the weather, change the look of Firefox, listen to music, or even update your Facebook profile. This article covers the different types of add-ons available and how to find and install them.

What types of add-ons can I install?

You can install these general types of add-ons:

• Extensions
  Extensions add new features to Firefox or modify existing ones. There are extensions that allow you to block advertisements, download videos from websites, integrate Firefox with websites like Facebook or Twitter and add features included in other browsers, such as translators.
• AppearanceThemes
  There are two types of appearance add-onsthemes: complete themes, which change the look of buttons & menus, and background themes, which decorate the menu bar and tab strip with a background image.
  Complete themes are considered Legacy add-ons and will be deactivated in Firefox version 57. For more information, see Built-in themes in Firefox - alternative to complete themes.
• Plugins
  Plugins add support for all kinds of Internet content. These usually include patented formats like Flash that are used for video, audio, online games, presentations and more. Plugins are created and distributed by other companies.
  Support ended for all NPAPI plugins, except for Adobe Flash, in Firefox version 52. See this article for details.
• Dictionaries & Language Packs
  Firefox can check your spelling but not all locales come with a dictionary installed due to licensing reasons. You can find and install a dictionary for your language. You can also install language packs that will change the language of the entire application.
• Search engines
  Firefox comes with a number of search engines already installed that you can use from the Firefox Search bar or directly from the address bar. If you want additional search engines, you can install them on the websites directly or from addons.mozilla.org.

Viewing and managing your installed add-ons

Search engines can be viewed and managed in the Search panel in Firefox Settings . For other add-ons:

1. Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
2. Select the panel for the type of add-on you wish to view or manage, such as the Extensions, AppearanceThemes or Plugins panel.

For detailed information on disabling or removing plugins, extensions or appearance add-onsthemes, see Disable or remove Add-ons.

How do I find and install add-ons?

For advanced users: You can also install add-ons from a file. If you saved the installer file to your computer, (for example, an .xpi or .jar file) you can install the add-on using the gear icon in the upper-right area of the Add-on Manager Extensions panel. Select Install Add-on from file... from the menu, then find and select the file.

Some extensions place a button in the toolbar after installation. You can remove those or move them into the menu if you want - see Customize Firefox controls, buttons and toolbars.

Troubleshooting add-ons

For information on troubleshooting problems with extensions, plugins or appearance add-onsthemes, see the articles below.

Problems with installing or uninstalling add-ons

• Unable to install add-ons (extensions or themes)
• Cannot remove an add-on (extension or theme)

Problems caused by add-ons

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
• Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
• Troubleshoot Firefox issues caused by malware
• Remove a toolbar that has taken over your Firefox search or home page
• Re-enable add-ons that were disabled when updating Firefox
• Add-ons that cause stability or security issues are put on a blocklist
• Add-on signing in Firefox