Had enough of Firefox.

[g8ina]

Now trying Chrome, looking good so far

[Ferral]

I have been using Opera for years now, just gets better and better all the time

[superlattice09]

I actually quite like firefox4. Well, it just can't fill all the needs of everyone.

[Paulus]

I stick with FF4 mainly for the following:

I like the save and quit feature of FF (although this seems to be disabled by default in FF4), which will restore all windows and tabs when you next open FF.
In Google Chrome, if you move the mouse to certain positions (near the text box e.g. above it) when highlighting text, it sort of inverts the selection. I'm embarrassed that I find this so annoying but I do! This may even be the "correct" behaviour but I prefer FF's way of doing it.
Ad block in FF seems to be able to block ads that appear within flash videos, which I find amazing for YouTube and on-demand TV services.
FF4 has gained many features from Chrome that I really like: ctr+back goes "back" in a new tab and carries over all history into that tab (so forward and back buttons behave as if it was not a new tab); dragging out a tab works (and it does not reload the page like it used to).

[this_is_gav]

I like the save and quit feature of FF (although this seems to be disabled by default in FF4), which will restore all windows and tabs when you next open FF.

Firefox button > History > Restore previous session.

I've made a shortcut to it directly under the Firefox button using the Personalize Menu addon, though I'm sure there's a way to set up a toolbar button for it.

[aidanjt]

Chrome: Spanner->Preferences->Basics->On Startup->Reopen the pages that were last open. Or, click the "recently closed" link at the bottom of a new tab page, and select whatever site or tab group you last closed that you want opened. Simples.