FF nightly and now stable have been my default browser for almost a year, and I have to agree with you. FF in all variants (as of today) regularly consumes more RAM than Chrome for my day-to-day usage. FF crashes on me several times per week. Netflix, YouTube, and it seems most React sites consistently seem to just chug in FF, but do fine in Chrome. I'm not sure what's happening here, but the hype about FF's new performance gains has not been fulfilled in my experience.

I've stuck with FF because I'm a web developer-- sadly, the money led me there from other more interesting lines of dev work-- and I don't want to see a single browser dominate the web the way IE used to.