You know, I'm impressed with Firefox pushing the envelope inside the browser window, but their chrome is still terrible: the tabs on top take up many more pixels than Chrome's do; closing tabs in rapid succession doesn't mimic Chrome's resizing; you still can't have favicons in the bookmarks bar without using Stylish or something similar; the bookmarks bar and the Bookmarks folder aren't one and the same; and so on. (EDIT: Mac; I think some of these are better on the Windows side, particularly favicons in the bookmarks bar)
The only reason I ever used Firefox any more was to use the Mozbar, and that's not an issue any more. I really would love it if the Mozilla Foundation stopped focusing on rendering and focus on experience. Normals go to the same seven (or nine) sites. Make using the browser to visit and interact those seven/nine sites as good as possible first.
Humorously I just saw exactly the opposite complaint - "I wish they'd stop focusing on visuals and start focusing on functionals".
They'll never please everyone. Chrome is for you (clearly given that it is obviously what you hold as your benchmark). It would be a lost cause pursuing that.
The only reason I ever used Firefox any more was to use the Mozbar, and that's not an issue any more. I really would love it if the Mozilla Foundation stopped focusing on rendering and focus on experience. Normals go to the same seven (or nine) sites. Make using the browser to visit and interact those seven/nine sites as good as possible first.