As I remember it, Chrome was way faster than Firefox, but I was in high school and probably stupid. Firefox wouldn't catch up to Chrome until Quantum, which was amazing when it first dropped, but now Firefox is slow again.
Currently I am feeling this too but only for one site, GitHub. Which is where is spend most time during the day...
Quite sad, I don't know if it's GitHub's fault or not but Firefox needs to figure out what's going wrong here soon or people like me may be literally forced to Chromium.
But Chrome won the vast bulk of its market share not because it was technically better in every way, but because they spent much more on marketing at the exact time IE entered terminal decline.