Install Adobe Flash Player

Download Adobe flash player

Adobe - Install Adobe Flash Player
get.adobe.com/flashplayer/

Then do the following:

rm flash -p
mkdir flash -p
tar xf install_flash_player_11_linux.x86_64.tar.gz  -C flash/
sudo cp -v libflashplayer.so /usr/lib/firefox-addons/plugins/
sudo cp usr/* /usr/ -a

Restart Firefox.

In Firefox, type about:plugins in the Location bar to confirm that the Adobe Flash Player is loaded.