Mozilla has a political stance that I do not support, and they openly use Firefox to push it. This doesn't get brought up enough on places that lean liberal such as HN, but it is a reason why I, and several other people I know, cannot use it in good faith.
It's also a fair bit slower than Chrome, which doesn't help.
Can you be more specific about what you perceive to be their political stance, how that impacts your browser usage, and how it differs from that of the other browser vendors?
It's also a fair bit slower than Chrome, which doesn't help.