In Firefox 68+ you can only disable multi-process by creating an environment variable named MOZ_FORCE_DISABLE_E10S and set its value to 1. You can either use a .cmd file to start Firefox or set this variable in the Windows Control Panel -> System.
di windows xp ada di system - advanced - environment variables - system variables
Trik ini hanya berlaku hingga versi 80.0.1 . Versi selanjutnya sudah tidak mendukung.
Untuk mencegah update, file maintenance dan update exe perlu dihapus.