I started using Firefox about two years ago. The only time I ever have to launch Chrome now is to specifically test Chrome compatibility. Other than that, I've never missed Chrome.
Firefox and multi-account containers was a game changer the first time I used it.
I quickly became delighted at just how speedy everything was. It's not as if I'd never opened Chrome before, but the difference was much more noticeable after using it as my primary browser for a few days. Even on my weird platform where Chromium can't use graphics acceleration, the browser is just stupid fast at getting web pages on screen.
I'm not, well, particularly happy about this. I think that browser diversity is super important, and I do still use Firefox on Windows and Safari on modern Apple platforms. But Chromium really does seem to provide the better experience.