I switched to Firefox from Chrome for personal browsing several months ago, after the Manifest v3 debacle. So far, it's been good!

Very few sites only work on chrome. Firefox is fast, and the auto tab discard works better for me than Chrome's equivalent (or the Marvelous Suspender), I really like container tabs, and the whole experience feels pretty snappy. There are some product affordances I don't get with Firefox (ex. being able to run math expressions in the address bar), but it's small potatoes.