Chrome really isn't that far ahead of FF or Opera. all three are still pretty close. The only real loser here is still IE. Their paltry developer tools and IE8's incompatibility with HTML5 has pretty much doomed it to the trash bin.
Just in case you needed some benchmark facts:
Web Intents is another cool feature in Chrome that's not even on the map for Firefox. Instead there's a "counter-proposal" called Web Activities that no one outside of Mozilla is talking about (and it seems pretty dead).
I still use Firefox, but the lack of leadership in these two cases is discouraging.