There was a time, around 2010 or so, that chrome was the clear winner with better launch times and a better UI. I switched away from FF in that time, but came back after the quantum update. There's still a couple things I don't like though. FF only recently started supporting date-pickers. It still doesn't support-month pickers. I've come across a handful of pages that don't work in FF at all (live metrics on Azure is one).
Not a deal breaker though. And these issues would go away with more market share, I'm sure.