I dont see how the competitiveness argument can still stand. I've been using both browsers for the better part of two decades now and chrome/chromium never was the better product. Sure it had slightly better devtools for a while but nowadays it is very difficult to argue either way. Performance was rubbish on both ends for years in a row, right now both seem to do fine. Firefox has sync, a significantly better product than whatever google comes up with every two years. So yeah, I think Mozilla has a good enough product to challenge chrome. What they don't have is comparable traffic to their site.

Oh and of course focus. Mozilla has lacked focus for almost a decade now with all the random products and initiatives they launch.