How to install flash player in Iceweasel?

Download install_flash_player_10_linux.tar.gz from http://get.adobe.com/flashplayer/. Extract the
downloaded compressed file using the command tar -xvzf install_flash_player_10_linux.tar.gz. After extracting
the file you will get a file named "libflashplayer.so". Copy this file into /usr/lib/mozilla/plugins,
and then restart iceweasel.