A lot of responses I see on any Firefox HN post talk about bugs/issues which have [mostly] been addressed by Mozilla. This includes separate processes per tab which came out just a few versions ago. The problem is that these issues have been resolved more recently vs a year or more ago. It seems many people tried switching to FF long time ago when those outstanding issues were still there so many didn't left up switching because the bugs put a bad taste in their mouth. At this point in 2019, from my perspective, FF and Chrome are functionally the same at this point so there's really no reason to continue using Chrome.