I've uninstalled Firefox and will be removing it from all of my computers. I had just started slowly migrating back to it with the performance enhancements in the latest update, but honestly I don't think I can get past a breach of trust at this level.
Google does track a lot of my data but they provide useful services in exchange, and in addition they make it pretty easy to see what data they have on me. Also Google's data is its competitive advantage so our interest in protecting my data from 3rd parties is aligned.
In short, Google tracks me sure, but they're pretty transparent about it. I do think some of the things Google does with Chrome and it's market position is less than stellar so I'm still exploring other options. If you have any suggestions I'd be happy to hear them.
They may be transparent about the fact that they're tracking you, but not about what they're tracking or when they're tracking it. And there's no way for you to find out because the vast majority of their software is not open source.