Firefox also does stuff that Chrome doesn't. I like having about:config, I like having some things from Test Drive, and a bunch of other things. But let's not make this a "which is better" thread.
Let's assume that Chrome is indeed leading the way. I'm quite okay with that. Firefox is still very clearly ahead of MSIE and Safari -- and even if it wasn't! Even if it was the worst popular browser. Someone has to be last, right? If it is being maintained and kept current (and it definitely is), I'd still use Firefox for not being tied to some big corp. That's what it's really about for me: independence, open source, free (as in freedom).