I think this is just what you are accustomed to. I use FF as my main browser. Anytime I use Chrome it drives me nuts because the UX sucks. But, the truth is that Chrome's UX probably doesn't really suck, I'm just not accustomed to it.
I can see that in a lot of cases. Accustomed, sure. I consider myself pretty adaptable, but still prefer Chromes UX over FF. If FF could be tuned easily to act "exactly" like Chrome, that might ease the transition for a lot of people. Honestly though, I also hate the way FF draws it's windows and widgets. It still feels like it has that just barely out of the 90's UI vibe to me. So aside from how it set's itself up by default for things, I also find it quite an eye sore. Opinions may vary.
