In fact, _better_ than Chrome for most websites (exceptions perhaps google's). I used to struggle with Chrome/Chromium hang and chew on CPU cores, crawl to a halt, crash, or just simply run out of memory or a regular basis. Switched to Firefox ~67-69 and such issues are completely gone. I still have significant CPU usage from background tabs occasionally even in Firefox, but the rest of the issues are all nearly inexistent (even though I have on average 30+ tabs open).
My tabs have gotten out of control (they are in the hundreds (due to reasons)), but Firefox handles it quite nice. It only gets restarted after updates, so they are long-lived as well.
Chrome seem to struggle when there are tens of tabs.
I personally know somebody who is currently running a Firefox with 3,000+ (yes, you read that right) tabs as part of their day to day workflow. Firefox just unloads tabs that weren't used for long and cause high memory pressure which is very neat feature for tab addicts.
I daily drive FF and even develop using it. Everyone else in the company use Chrome. Recently one of our clients complained about a performance issue, I tried to replicate it on my fast PC, but could not replicate. The people who could replicate it were on Chrome, but when they followed the replication steps in FF, the problem disappeared.
Google web applications still not great, but still usable I find. Facebook performance isn't great either.
