I've been keeping ten to twenty windows open, with 100-800 tabs total, in Firefox, since before Chrome existed. Chrome never has even come close to being able to handle that. I am so baffled by stories like yours.
Same here. I use Firefox with Tree Style Tabs extension with lots of open tabs. I could never manage that in Chrome.
Ever since the Quantum updates Firefox has become faster but it wasn't very slow to begin with. Maybe it was a bit slower on some netbooks bit it hasn't been an issue on my PC.
