Speed almost doesn’t matter for me, since Chrome allows ads and Firefox actually lets me use adblockers and privacy badger. The time wasted on ads are way larger than the time spent loading a page.

Firefox in general is faster for me than Chrome in many pages

However a notable exception are web games and web based game emulators. They’re a lot slower on Firefox and i get horrible sound crackling whereas on Chrome its much better. It’s been like this for years with no seeming improvement.