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

How to disable extensions and themes

Disabling an extension or theme will turn it off without removing it:

Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
In the Add-ons Manager tab, select the Extensions or Appearance panel.
Select the add-on you wish to disable.
Click its Disable button.
Click Restart now if it pops up. Your tabs will be saved and restored after the restart.

To re-enable the add-on, find it in the list of Add-ons and click Enable, then restart Firefox if required.

How to disable plugins

Mozilla plans to drop support for all NPAPI plugins except for Flash in March 2017, when Firefox version 52 is released. See this blog post for details.

Disabling a plugin will turn it off without removing it:

Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
In the Add-ons Manager tab, select the Plugins panel.
Select the plugin you wish to disable.
Select Never Activate in its drop-down menu.

To re-enable the plugin, find it in the list of Plugins and select Always Activate in its drop-down menu.

How to remove extensions and themes

Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
In the Add-ons Manager tab, select the Extensions or Appearance panel.
Select the add-on you wish to remove.
Click the Remove button.
Click Restart now if it pops up. Your tabs will be saved and restored after the restart.

How to uninstall plugins

Most plugins come with their own uninstallation utilities. For help uninstalling some popular plugins, go to this list of articles and select the article for the plugin you want to uninstall.

Troubleshooting

For help diagnosing problems caused by extensions and themes, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.
For help diagnosing problems caused by plugins, see Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems.
If you are not able to remove an extension or a theme, see Cannot remove an add-on (extension or theme).
If you are not able to uninstall a plugin, see Manually uninstalling a plugin.

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