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Showing content from https://support.mozilla.org/en-US/kb/find-and-install-add-ons-add-features-to-firefox below:

Find and install add-ons to add features to Firefox

Add-ons let you add bells and 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?

These general types of add-ons can be installed:

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, check your grammar and spelling, and so on. Community-created extensions can be found on addons.mozilla.org.
Themes
Themes change the visual appearance of Firefox by setting a custom background image in the browser's header section and the colors used in the tab strip, address bar, menus, and so on. Firefox includes built-in themes and others created by the community can be found on addons.mozilla.org. For more information on built-in themes, see Built-in themes in Firefox - alternative to complete themes.
Plugins
Firefox automatically downloads and installs the Google Widevine CDM for watching Digital Rights Management (DRM) controlled content and an OpenH264 plugin for video calls.
Dictionaries
Firefox can check your spelling, but not all locales come with a dictionary installed for to licensing reasons. You can find and install a dictionary for your language.
Language Packs
Language packs change the language of Firefox's user interface. You can change languages in Firefox's settings menu and community-created language packs can be found on addons.mozilla.org.
Search engines
Firefox comes with a number of search engines already installed. You can access them from the Search bar (if enabled) 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

Most types of add-ons can be managed directly from Firefox's Add-on Manager. To access the Add-on Manager:

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

Search engines can be viewed and managed in the Search panel in Firefox Settings .

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

How do I find and install add-ons?

Here is an overview to get you started:

Firefox may offer personalized recommendations. Click the menu button , click and select .
To install a recommended add-on, click the blue + Install Theme or + Add to Firefox button, depending on the type of add-on.

At the bottom of the list of recommended add-ons, there's also a Find more add-ons button you can click. It will take you to addons.mozilla.org where you can search for specific add-ons.

For advanced users:

You can also install a signed add-on from a file. When you install an extension from

addons.mozilla.org

or a developer's website, Firefox will automatically download and install a file with a .xpi extension. If you save this file to your computer, you can later install the add-on using the gear icon

in the upper-right area of the Add-ons Manager

panel. Select

from the menu, then find and select the file.

Once an extension has been installed, you can pin its icon to the toolbar for easy access. See Manage your extensions using the extensions button in the toolbar for details.

Troubleshooting add-ons

For information on troubleshooting problems with extensions or themes, see the articles below.

Problems with installing or uninstalling add-ons

Problems caused by add-ons

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