Can't login to Community on Firefox

I click “Submit” but nothing happens.

Firefox 51.0.1 (64-bit) on macOS 10.12.2 Sierra

Works fine on Safari.

Hi there, thanks for letting us know about this. Unfortunately, we weren’t able to reproduce this problem, so there’s no reason it shouldn’t be working on Firefox. What we could suggest is to use this link: Sense and then try again. Let us know if that works, thanks!

just logged on from the office on the FF client, somewhat shaky on the corporate machine. but alas it works.
if you think i can help let me know.