Extensions and themes are add-ons or small pieces of software that add new features or functionality to your installation of Firefox. The Firefox Add-ons window lists your installed add-ons and provides a simple way to uninstall extensions and themes.

Uninstalling extensions

1. At the top of the Firefox window, click the Tools menu and select Add-ons.
2. In the Add-ons window, click the Extensions tab if it is not already selected. The set of installed extensions is displayed.
   
   
   
3. Select the extension you want to remove to display the "Options", "Disable", and "Uninstall" buttons for that extension.
   
   
   
   
4. Click the Uninstall button.
   
   
   • You will be asked to confirm whether or not you want to uninstall the extension. In the Uninstall window, click Uninstall to confirm that you want to remove that extension.

The extension will be gone the next time you start Firefox.

Note: You can uninstall multiple extensions before you restart Firefox to complete the process.

If you cannot uninstall an add-on, see Cannot uninstall an add-on.

Uninstalling themes

Note: Make sure you are not currently using the theme you want to uninstall.

1. At the top of the Firefox window, click the Tools menu and select Add-ons.
2. In the Add-ons window, click the Themes tab if it is not already selected. The set of installed themes is displayed.
   
   
   
3. Select the theme you want to remove to display the "Use Theme" and "Uninstall" buttons for that extension.
   
   
   
4. Click the Uninstall button.
   
   
   • You will be asked to confirm whether or not you want to uninstall the theme. In the Uninstall window, click Uninstall to confirm that you want to remove that theme.

The theme will be gone the next time you start Firefox.