Problem with buttons

Hello, since yesterday buttons like "Sync Account", "Enter Giveaway", "Create Discussion" or that button to hide games stoped working for me. When am clicking on it nothing happens. I don't know why, I did not change browser or any setting/plugins (I use Firefox).
So today I installed Chrome and here is everything OK.
Do anybody know how to repair this ? I did clear cookies, restarted computer, turned off adblock.

Nevermind, after few days it is working again, I did nothing this time also. Probably firefox update did.