Un-/Follow a Game
Button is still there, check if there's anything installed that could block the button, like adblock.
First: Reload the page.
Then try to run Firefox without plugins, safe mode disables all plugins automatically so try that.
If that doesn't help either you got some problems with your PC, viruses or something.
my Google Chrome is still showing it...but Firefox recently had a mega-update, I think it has to do something with that...but anyway thanks for your suggestions! :)