In my use case, it's still a problem if you have a bunch of tabs loaded, but I think the class of problem is somewhat different than it is in, say, Chrome. Sure

In my use case, it's still a problem if you have a bunch of tabs loaded, but I think the class of problem is somewhat different than it is in, say, Chrome. Sure, Firefox gets a bit sluggish with 500-700 tabs open, but since I don't have a habit of keeping a single session open for days (then it IS a problem), the net effect is relatively small since restarting Firefox generally behaves as if the inactive tabs from the last session weren't open. Obviously, if you click through tabs you opened previously, then it'll load them but otherwise it's fine. So there's some truth to it, but as with most things, it depends. I use Firefox mostly because I have a terrible habit of clicking any link that looks remotely interesting with the intent to come back to it for later reading. Granted, it rarely works quite like that, but Chrome became a bear after 150-200 tabs (and often started capping my RAM). For all its faults, Firefox (again, in my use case) still manages to stay around ~2GiB unless I do something stupid or watch a bunch of YouTube videos (under Linux). Chrome does well, but the UI became unusable since you couldn't scroll through opened tabs without having specialized addons and such. I'm not sure if this is still the case, and even if it's changed, I don't think I'd go back. The RAM usage was too much, but I fully understand Chrome was probably never designed with my browsing habits in mind. Whereas I've seen claims that allege a handful of Firefox developers are tabholics. I'd believe it. Somewhat off-topic: One thing I really like about Firefox is the profile manager. I've started creating separate profiles for general browsing, documentation, and videos sometimes with extensions tailored for each. It was a slight pain to change my habits around to accommodate that, but I've noticed if one instance hangs, it's not much of a problem. With multiprocesses on the horizon, maybe this will cause me to change my browsing habits again, but I think I like the profile isolation for enough reasons unrelated to performance to continue as is. Perhaps this is abusing it somewhat, but it works for me. If you keep a relatively clean profile with few tabs open, Firefox stays pretty snappy.