Firefox market share is going to continue to shrink as Chrome takes over. They've just been way too slow to respond. It is a shame since feature wise Firefox is a superior browser.
Not necessarily. The two are about at market share parity now, and FF4 allows Mozilla to push updates and version numbers more continuously, like Chrome/ium. From this point on it should be a neck-and-neck horse race, but frankly as long as they're both leaving IE in the dust I'm cheering for, and using/developing to/supporting both.