Firefox took marketshare from IE because Microsoft abandoned it for several years (IE6) then did an half-assed update with IE7. It was a big pile of poop and Firefox succeeded not because it was a great product because because it was the right product at the right time.

For Chrome on the other hand, its near-monopoly situation is worrisome but it's actually a pretty good product. So there is no pragmatic reasons to leave it for Firefox, only ideological reasons and it's a driver nearly not as powerful as suffering every day.