Re: So, OKCupid is entitled to their views
No, you are totally missing the point. OKCupid are using their website to launch a campaign against a company, because someone who works there holds views they don't like.
A comparable thing for FF to have done would be to show a popup "This site has been linked to homosexual activity. Mozilla does not condone homosexual acts and accepts no responsibility if you choose to continue viewing this site".
Don't let your personal bias against other people's bias distort the facts. A company is not the CEO. He is allowed personal views. Arguably, one company attacking another company is grounds for a lawsuit, in the US at least.