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Showing content from https://support.mozilla.org/en-US/kb/cannot-remove-add-on-extension-or-theme below:

Cannot remove an add-on (extension or theme)

This article describes how to uninstall an extension or theme that can't be removed by following the instructions in Disable or remove Add-ons or Remove a toolbar that has taken over your Firefox search or home page.

Note:

The

Refresh Firefox feature

can fix many issues by restoring Firefox to its default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process.

Uninstall add-ons from Firefox Troubleshoot Mode

If you can't access the Add-ons Manager or if the option to remove a certain add-on is disabled, you may need to uninstall it from Firefox Troubleshoot Mode.

Click the menu button , click , select and click Restart in the Restart Firefox in Troubleshoot Mode? dialog.

Note: You can also start Firefox in Troubleshoot Mode by holding down the Shift key while starting Firefox.holding down the option key while starting Firefox.quitting Firefox and then going to your Terminal and running: firefox -safe-mode You may need to specify the Firefox installation path (e.g. /usr/lib/firefox).
In the Firefox Troubleshoot Mode dialog, click Open.

Once Firefox has started in Troubleshoot Mode, try removing the add-on again and then restarting Firefox.

Uninstall add-ons from the Windows Control Panel

Some add-ons are installed by other programs. You may be able to remove the add-on from the Windows Control Panel or Settings page.

Manage extensions installed by other software

Sometimes installing or updating other software will add an extension that can't be removed from within the Add-ons Manager because the option to remove it is disabled or not functional.

The software that added the Firefox extension may include an option to remove it. You should visit the support site of the software provider for more information. As an alternative, simply disable the extension in the Add-ons manager if you no longer wish to use it. To disable the extension, click the blue toggle.

Uninstall manually

If you can't remove an extension from Firefox using the other methods described above, you can manually remove it. First navigate to the folder where extensions are installed:

Open your profile folder:
- Click the menu button , click and select .From the menu, select . The Troubleshooting Information tab will open.
- Under the Application Basics section next to Profile FolderProfile Directory, click Open FolderShow in FinderOpen Directory. A window will open that contains your profile folder.Your profile folder will open.Your profile directory will open.
Open the extensions folder inside your profile folder. Inside the extensions folder there are folders or XPI files for each extension and theme that you have installed.
To determine which folder or XPI file corresponds to the extension you want to uninstall, return to Firefox and the tab.
In the Extensions section, find the extension you want to remove and note the string in the ID column.
Click the Firefox menu and select .Click the Firefox menu at the top of the screen and select .Click the Firefox menu and select .
Delete the folder or XPI file that corresponds to the extension ID you noted above.

Manage globally installed extensions

In rare cases, extensions are installed globally into the Firefox installation folder or using the Windows registry. See this article on Extension Workshop for more information. Follow these steps to remove a globally installed extension:

Based on information from Uninstalling add-ons (mozillaZine KB)

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