I just deleted my okcupid account. They provide a form for explaining why. I told them their anti-firefox message was unacceptable, and that I would do my best to urge as many people as possible not to use okcupid.

And I will keep that promise. When dating sites come up in conversation, I won't mention the firefox incident, I will just rubbish okcupid and describe all its flaws - such as them revealing your browsing history to other users until you pay them money. How many online businesses hold new user privacy as ransom for full payment?