Nothing wrong with Firefox. The problem though is that too many people have been convinced that some how Google is better. I personally do not think that it is about details people argue about. It more about using what they know, what their friends know, or what their friends will think is cool. In the end you either care about having an open web and user focused browser or you do not. Most people do not it seems.

The challenge for Firefox is that if user base is too small, developers will no longer test their sites against it. The other issue is that it is not clear if Firefox can keep pace with Google. For example Firefox desktop does not support WPA, and mobile versions it is not complete. It will be interesting how things will evolve. Maybe Google will even take steps to actually keep Mozilla and Firefox around and viable just to keep the Monopoly busters away. Who knows.

For me I do care, and will use Firefox until it is not feasible to do so if that day comes. At the moment it is just fine. Who knows the future.