you must modify ''dom.ipc.plugins.enabled'' type in the address bar '''about:config''' then press the button''' i'll be careful i promise''' then type in the bar '''dom.ipc.plugins.enabled''' then '''Double-click''' on it, to make it '''false''' exit firefox and restart-it. for more info : [http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins#Windows_and_Linux Windows and Linux plugin-container] thank you Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Thank you.