Does anyone else find Firefox hideous from an aesthetic perspective? I believe in the work Mozilla does, but I can't use Firefox without being distracted by it. Chrome is gorgeous and gets out of my way, allowing me to focus on what I'm doing. I did see some Firefox beta sketches a while back on HN, and they looked similar to Chrome, so hopefully they go that way.
I'm curious what you find "hideous". 3.6 -> 4 was a pretty big overhaul, but I think it looks pretty good. I customize a bit (small buttons, get rid of the search box & home button) and I may be baised.
I'll say that Firefox isn't perfect and there are quirks & oddities with bits of the interface. I'm sure there are bugs for most of them though.
(note: I work at Mozilla on Firefox, so while I'd normally be curious, I'm invested in fixing problems!)
Chrome and Firefox take up almost exactly the same amount of vertical space on my system. Except for some minor differences, their UI is almost identical.