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.
I tried FF earlier this year. It sucked. Everything just took extra clicks. The password manager was a pain and didn't interact with my phone apps properly.
I know the complaints against chrome. When it starts forcing me to watch ads I might try FF again.
Hey, at least installing a foss browser won't slow down your phone like a spyware app, you could always try something like Mull even for only a portion of your browsing if you have ~80MB to spare. I suggest it because I hate some of that extra bullshit that comes with standard Firefox. Also there's tons of projects that try similar stuff with Chromium! Like Mulch. Way better defaults than Chrome
The Android FF is not a great user experience for sure. On desktop it's just fine but Android is janky. I tolerate anyway to support Firefox but chrome is miles better on mobile.