I also have this problem and I don't even use Ghostery. Just plain vanilla Firefox 32.0.3 on Windows 7 with Cookie Monster and AdBlock Plus.

Went so far as to allow cookies because that fouls up a lot of sites and this looks really interesting, but still no dice. I'll see if updating to 33.0.2 helps.

EDIT: Nope. Clicking any button still has no effect.