How about knowing the history of the flagship product? Seeing the success or failure of ideas over time? And all of that in the domain of actually being involved with the company/product most of that time? You have to know business AND you have to know products.
biased strongly against a group of people
You really need to make some separation here, at least in the Firefox case. On the one hand, you have a donation made years ago toward a specific legal cause. There are a lot of ideological reasons behind that, and not all of them involve marginalizing the individual (e.g. You can be against making it marriage, but be *for* increasing the rights of civil unions). On the other, you're saying he is against the people themselves. I'd argue that's a wider valley than you think it is.