Likewise. FF turns my 2012 rMBP into a frying pan for any web page with moving content (video, animated GIFs, ads) or just significant JS (Google docs). I would prefer FF, so I keep checking every couple of years, but no improvement. Unusable.

On those same pages, Chrome and Safari work just fine.

If Apple were making MBPs better each year instead of demonstrating their "courage" ("This time we're taking X away from you because as long as Windows is the only competition, whaddya gonna do about it?") I would have already bought a new one, and that would presumably have more powerful graphics and not get as hot, but I would still want to verify that FF wasn't running the battery down faster than Chrome or Safari.

That's interesting. Is there somewhere that lays this out (which models, etc)? This is a retina display so I'm curious why it would affect some and not others.