I guess today is more a point of "tradition" than properly "quality". Those who are used to Firefox will defend Firefox and those who are used with Chrome will defend Chrome, like ROS and TLJ fans. I'm on the Firefox team and always heard people saying Chrome is better, though I don't have anything against the fox: Privacy, Incognito Mode, and for my circumstances, it browses at a good speed. The only cons is that until a few months ago, most add-ons were incompatible due to updates, now it's already normalized. Still then, Firefox also have its source based (I think that's how is called) browsers, so Pale Moon for slower connections and has only the basic, Waterfox which tries to be the most compatible with add-ons and a few others which I don't recall now and haven't used much.