[Losi]

Are you using vanilla Firefox with zero plugins? If not, try uninstalling all your plugins and then try. If this still doesn't work, I recommend flashing and updating your BIOS. If it STILL doesn't work, Malwarebytes or Windows Defender might think some part of the Firefox application is malicious. Make the Firefox source folder and application an exception in Malwarebytes and Defender. If that still doesn't help, at least you tried.