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.
Workona + The Great Suspender make it manageable for me (72 tabs open currently, probably peaking over 100 in an average workday).
I agree. I tried to switch several times since 2016. A couple of months ago, Firefox finally performed well enough I could do it. I'm the type of person who has five windows open with twenty tabs each, and it handles that now.
I also added Container Tabs Sidebar, DuckDuckGo Privacy Essentials, Firefox Multi-Account Containers (this thing is amazing for keeping sites separate!), and uBlock Origin. I like it now more than Chrome.