Except that Firefox + uBlock renders many, many websites and apps poorly.

And still a better experience than chrome with ads, plus I almost never encounter a website with problems

I haven't hit any real problems with Firefox. Maybe it's the sites I visit. Mostly news, shopping, and tech stuff.

The only real exception I can think of is that Google Meet's audio quality has recently been worse under Firefox than under Safari's. My guess is that the issue is on Google's end (since Firefox used to be fine), or that maybe Safari has access to some special microphone APIs.

Since you mentioned Safari, I assume that you're on MacOS where Firefox and other alternative browsers are effectively hindered at the framework/API level there, as such browsers have problems there that don't occur Linux or Windows.

For example, the audio in FF outside of Apple sounds real clear and overall great in my experience.

I can't think of a single one where Firefox and uBO cause issues.

It renders them correctly, just not always exactly the same as Chrome. It's hard to blame devs for not testing on a browser with so little market share.

Some Javascript or maybe Canvas heavy pages run much more slowly on Firefox and are almost unusable on Firefox for Android. I find that this is rare, though.

I'll keep using Firefox + uBlock + Personal Blocklist + Dark Reader + Disable Javascript + Disable CSS + Tampermonkey + Old Reddit Redirect + CORS Everywhere + Consent-O-Matic + Hide YouTube Shorts + Load Reddit Images Directly + ...

I find that 99%+ of sites render far better in Firefox with uBlock Origin than with Chrome. Pages render prettier, faster, and more readable. The 1% of pages that render worse are still faster and generally more readable if not quite as pretty. That's a trade I'll make any day.

I have yet to encounter a site, that wasn't broken server side in some way, that didn't render usefully.

Please cite some actual examples.

Have you got any examples, because this has not been my experience at all.

Not even in the slightest.

Unfortunately, Firefox on Android still has a long way to go. I have to resort to using Chromite (Bromite fork) with NextDNS for adblocking, otherwise the browsing experience on mobile is not really good.