Hello guys I found al alternative Solution after some research for some reason after I installed Flash player from Ubuntu Software center firefox used Gnash instead of flash player so I downloaded install_flash_player_11_linux.i386.tar.gz

to install it just open terminal and do the following commands

tar zxvf install_flash_player_11_linux.i386.tar.gz
sudo cp libflashplayer.so /usr/lib/mozilla/plugins

now you just copied the files to firefox, that resolved the issue for me since I couldnt see the online content from cisco academy

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