I just switched yesterday after learning more about why I should here in Lemmy.
The last time I tried FF (many years ago) it was incredibly slow, so I went with chrome. But the FF of today is actually noticably quicker.
Also, FF offered to import all of my bookmarks, autofills, passwords, history, and even my extensions (if a FF version exists of course, almost all of which did) and did so seamlessly. It was the easiest software switch ever.
Apart from privacy concerns, Google has started to add some really bad features to Chrome, such as "Manifest V3" and "Web Environment Integrity". These limit your ability to block ads or generally modify your device or the websites you're visiting, and are just a bad for the web as a whole. WEI in particular is basically DRM for the web, so Google checks your device and denies you access to websites if they don't like it. But as long as the majority of people keep using Chrome they can just force these things onto everyone.