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.

Uninstall mozilla firefox command line