DO NOT DOWNLOAD!!! Often makes you enter another code, and it slows down Firefox, whether or not it is active or needs code, didn't know this was causing it until Firefox said this extension was slowing down Firefox. BTW others say doesn't work on MacOS, but I am on Windows. Just don't download at all, Windows, MacOS, whatever, Apple always has been terrible when it comes to any services on devices/software they didn't make...