Umnable to install MetaMask using Firefox browser on Mac OS 10.13.1. Error message saying the file is corrupt.

second time i open firefox, metamask isnt logged in. Had to import existing DEN using my 100% correct seed which fails every time. No support from the devs, really dissapointed.

I have tried installing on Firefox on Windows 10 system and it won't install claiming the extension is corrupt. I doubt the extension is corrupt as others are able to install. Might be my OS. Still, I can't give higher stars to something I have yet to be able to use.

YOu cant import a new account when i choose file the window closes so fix that