Why doesn't OkCupid take a bolder stance and remove all JavaScript from their site? Brendan invented it. I guess that wouldn't be convenient. Better to ask users to inconvenience themselves. This really isn't fair to all of the people who have worked so hard to make Firefox what it is today.
But he is the CEO of the company, and what the company does going forward does depend on him a lot.
I think this is the key difference between boycotting the browser and boycotting the language.