I really don't get all the hate against Chrome's UI. I love it, as does nearly my entire office. It keeps the crap I don't care about out of my way and let's me see more of the crap I do care about (you know, the page?) And yes, it's stupidly fast.
None of that condones Firefox just blindly lifting their interface, of course. But on the flip side of that coin there are far, far worse places to look for inspiration!