If all methods fail to remove or uninstall an extensions, user can manually uninstall an add-on using steps below, which work for user-centric add-ons: Workaround 3: Uninstall manually user-specific extensions, toolbars, themes and add-ons With Firefox in safe mode, some extensions and add-ons Uninstall button in Add-ons window, which previously disabled, is now enabled for proper uninstallation. Applications/Firefox.app/Contents/MacOS/firefox -safe-modeįirefox should start up with a Firefox Safe Mode dialog.

Alternatively, go to the Utilities directory (in the Applications folder) and open Terminal, then run the following command: In Mac OS X, hold down the Option key when starting Firefox to run it in Safe Mode. Alternatively, type in Run box or Start Search box (for Windows Vista, Windows 7, Windows and Windows 10) the following command: In the Mozilla Firefox folder, select Mozilla Firefox (Safe Mode). In Windows, click Start, open the All Programs list, and navigate to the Mozilla Firefox folder. To access Safe Mode, close all Firefox windows. If the extension, toolbar, theme or other addon does not provide any uninstaller, and uninstall button is grayed out, try to uninstall the add-on in Safe Mode.

Workaround 2: Uninstall from Firefox Safe Mode Remember to exit from Firefox before start the uninstallation process. Typically, uninstallation of program can be done through “Add or Remove Programs” (in Windows XP) or “Uninstall a program” (for Windows Vista, Windows 7 and Windows 8) or “Apps and Features” (in Windows 10) in Control Panel or Settings of Windows. Some add-ons or extensions is installed by their respective application programs, and can be, or need to be uninstalled through the respective setup installer/uninstaller. Workaround 1: Uninstall using program’s uninstaller or from Windows Add or Remove Programs In such cases, try the following workarounds to manually force uninstall, remove or delete the ‘stubborn’ add-ons, themes, toolbars, or extensions. The “Uninstall” button on the Add-ons window appears to be disabled or grayed out. In Mozilla Firefox web browser, sometimes an extension, toolbar (which is installed as add-on), theme or other add-on cannot be uninstalled or removed through the use of the Firefox Add-ons window.

How to uninstall mozilla firefox on pc