Have you updated Firefox recently?

I use a Mac - updated FF last Wednesday evening, and the same problem started for me - immediately. It also affects the New York Magazine. When I change to Safari, everything is normal.

I've been posting at the Firefox support site - trying any number of fixes. none of them work. The regulars on the FF board insist it's all due to FB, but I'm betting FF is more to blame.

This has affected both Mac and PC users, and from what I read on the complaint site at FB, the problem started after the FF update.

I'm going to sign my husband up for FB, using his computer that has an older version of FF. Want to see if he has the same problem.

In the meantime, I use Safari for FB.