However.
Try opening any article from The Guardian on Firefox mobile. Even a good phone will start feeling sluggish and laggy and weird. An old phone will just go catatonic, get hot, and OOM the whole browser.
Surely this is partly The Guardian's fault. (Should it surprise me that the paper that poses "left" for the upper middle class is also incompatible with any but corporate software from Big Tech?)
But it's also definitely Firefox' fault too. Something is wrong with the implementation. If Chrome can render these sites smoothly, Firefox should be able to.
Firefox would only have an excuse if Google had some special APIs on Android, or were doing something to actively sabotage the Firefox experience. I'm not willing to get quite that paranoid yet.
There are some other browsers, but who the hell wrote them? How much of what you see in the app store is legitimate open source, and how much is OSS that some opportunist put their own trackers into? I'd love a good alternative, but I don't see a lot worth trusting.
So it's Firefox for most things, and Chrome when Firefox gets all slow and laggy. Or, Firefox for news articles, and Chrome for businesses' websites.