I've been switching to Firefox for private use a year ago, but overall I find it not good. Weird bugs, usability issues, dev tools not that great, etc. And privacy-wise, the defaults don't seem great either. There was something about containers that are supposed to prevent tracking between different domains, but if you actively have to create containers rather than them being automatically applied on each domain, then that's not much use since it makes things cumbersome to use.