It depends I think. I found Chrome to be a tiny bit faster but then ads bogged the page down so most of the time, Firefox is faster for me.
In some very rare cases when I need to disable ads blocking, Chrome is indeed faster but I'd rather abandon websites rather than disable ads blocking.
So if you love ads, Chrome is better. If you hate ads like I do, Firefox is miles ahead.
This study failed to take into consideration the need to feed information to AI. Companies now prioritize feeding information to AI over actually making it usable for humans. Who cares about analyzing the data? Just give it to AI to figure out. Now data cannot be analyzed by humans? Just ask AI. It can't figure out? Give it more so it can figure it out. Rinse, repeat. This is a race to the bottom where information is useless to humans.