I think the biggest one for me is less a case of it being missing, more Chrome's implementation being better, and that's the Timeline tab. Firefox not only does

I think the biggest one for me is less a case of it being missing, more Chrome's implementation being better, and that's the Timeline tab. Firefox not only doesn't implement it natively (redirecting you to a web app at `profiler.firefox.com`), it also lacks screenshots, dropped/rendered/frame durations. Overall, it also seems less accessible to me. It may well be that it's much more powerful in some respects, but I've never got my head around it enough to work that out. I do very much rate its Memory Tree Map view, though. Big advantage over Chrome for rapid debugging of where memory goes.