[ubuntu] Adobe Flash Player crashes (Tibia game Firefox)

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http://ubuntuforums.org – Hello there, I haven't been using Ubuntu for a while (12.04 was crashing almost constantly, so I abandoned it). Now I have just installed Ubuntu 13.04 and so far so good=] I wanted to play MMORPG-type game on Firefox, but Adobe Flash Player freezes. When this window appears I am unable to click either Allow or Deny. After a while it crashes. Any ideas how to fix it? When I go to Adobe's website it says: "You have version 11,2,202,291 installed" Regards Jet P.S. Can you remove software using or I need to use Synaptic for that? (Hardware)