I've been using Chrome as my primary browser for almost two years now, but the Firefox 4 nightlies are really getting impressive and it's starting to become a viable alternative to me. The Omnibar extension, superior font rendering, and tabs-on-top address a lot of the common usability complaints and Firefox's JS performance is finally on-par, and in some cases much better (especially where graphics are intense), than Chrome/V8's.
Chrome still has much more pliable tabs, but things are finally looking up again for Firefox, and it's about time.
Fully agree, and now that FF4beta7 fixed some of it's font issues, I'm switching back to it from Chrome. Here's why:
1) Panorama (a.k.a. tab candy). I can finally organize my tabs into little projects.
2) Much less restricted extension support. There a number of extensions that just aren't possible on chrome.
3) I hate the chrome start page, while helpful I find it usually leads me to distracting sites CoughHNCough instead of the reason I opened the browser instead. I call it Google's "Keep browsing" tactic. More annoying It always comes up on new tab/new window, even if you have the default home page set otherwise.
Chrome still has much more pliable tabs, but things are finally looking up again for Firefox, and it's about time.