This extension doesn't work for Firefox. It will let you login using SSO (such as Google, Apple, etc.), but not regular email. I escalated this to support, and they say they are unable to reproduce the problem internally. They had me do all kinds of things - screenshots, a screen recording, reinstalling Firefox...

Guess what? Now I'm going public to call out your bug. If you're not going to fix it, we're going to make that known to other users so they don't waste their time.