I use firefox nightly. I don’t mind the telemetry going to firefox. I know it’s a bad thing… But still, if it helps them it’s fine.
But performance wise, it’s not bad. It’s good enough. And with extension support rolling out soon, firefox might be really good.
Vaultwarden. And take regular back ups. I don’t trust my passwords to be safe anywhere other than my own servers. The chances of my server being hacked is very less.