Until recently, I used Firefox on my Mac, and had been for a couple of years. I got tired of the browser being a bit slow and consistently consuming 20-30% CPU even when not doing anything. My MacBook Pro's fan was running 100% of the time. I don't have many tabs open and never found an explanation.
Last week, I decided I had enough, and switched over to Chrome. Now the fan doesn't run anymore, and Chrome consumes much less CPU. I was also quite astounded by just how much faster Chrome is. Firefox feels fine when using it, but even with all the Rust stuff they've integrated, it still can't measure up to Chrome. It feels like I've upgraded my machine.
I don't miss anything from Firefox. I wouldn't mind having something like container tabs, but I can do without them. On the contrary, I discover things I prefer in Chrome. Like the really superior 1Password integration that fully enables form fields, or the way keyword searches work from the address bar.
I say this with some regret — I'd rather have Mozilla dominate the web than Google. But if they had thousands of people working on Firefox and still couldn't make it as good, I'm not holding out hope.