Yeah After closing firefox completely and reopening it works with CustEm unenabled so I think it was that because I dont use anything else but solved now thanks
http://i.imgur.com/2K1zM8Z.png http://i.imgur.com/bTdvUi1.png http://i.imgur.com/X3VgARS.png
This happened on Firefox browser when I tried to join a game and also when I tried to host a game in sandbox, un-enabled CustEm via turning off GreaseMonkey and it still was bugged. Opened EM in Safari and it worked normally. Just FYI can't figure out why it's doing that.