With every new version, i give firefox another try and it always just feels sluggish compared to chrome. The UI is not as responsive and the pages don't seem to load as quickly. I don't know if there's any actual data or measurements to back this up and i haven't tried to measure any speed differences, but for me the reason I use chrome instead of firefox is absolutely an engineering problem and not a marketing one.

I'd much rather use a Mozilla product than a Google one, but chrome is simply a better browser.