As simply as the title states, sometimes when I click the red circle with a number to go to my new inbox messages in the StackExchange Dropdown, nothing happens. I've never experienced this before, it's only begun lately and it seems to be happening more and more. What could be wrong?
Edit: this user has the same problem, and he is also using FF12, which cannot be a coincidence.
Stack Exchangeinstead of the red circle works fine though. (CC @balpha)