“Welcome to our enhanced privacy features! Please start by giving us your e-mail or by logging in with your Google or Facebook account.”
Bitch, those are the exact things I’m trying to keep my information away from. And, no, I don’t trust Mozilla as far as I can throw them, either.
If you are using a VPN you are already putting your trust in the provider not to look at what you are doing. Logging in is the least of your worries if you don’t trust them.