That may be true on desktop. But, unfortunately, the mobile app is way behind chromium. From being unresponsive, to outright buggy. It's not a good experince. It's been 2 years since the rewrite but it's not getting much better or even close to fixing most of its issue. Meaning, using firefox on android is a handicap on yourself.
The only inconvenience is that it doesn't prefill my credit card details, which is probably a good thing from both a security and hip pocket angle anyway
I have used Firefox on many smartphones since 2014. It's not an anecdotal experience of mine. It's the difference between chromium based browsers on android being more efficient compared to Firefox. Here's the github issue which was open from 2020, now moved to Bugzilla: https://github.com/mozilla-mobile/fenix/issues/12731#event-8105829420
If this did not happen it would not have been kept open for so long. Just search tab reload in closed issues you will people still complaining while the repo was accessible.
I am basically the same. I'm loving the ability to use uBlock Origin across phone and desktop and practically never see ads, but some sites just don't work for me in Firefox. Like anything where I have signed up with my Google account, or my online banking. In which case I have Chrome installed as a backup. If I could purge it completely I would, but this works for now.
Yeah, to be honest the FF Android experience just can't match Chromium.
I don't really NEED to, so I'm not switching from Firefox anytime soon, but I wish they'd at least fix recently closed tabs reappearing every time I reopen the darned thing...