I would argue that this position is contrary to Mozilla's stated values about freedom on the web. If they truly support freedom, that should include my freedom

I would argue that this position is contrary to Mozilla's stated values about freedom on the web. If they truly support freedom, that should include my freedom to decide which add-ons I want to run on my browser. Sure, they can have an opinion about where should the web go, and in fact it would probably be a very well-informed one. But they can't both claim to support freedom for their users while, at the same time, imposing their ideas on their users.