Say, hello to flashplugin-nonfree package
 
This package acts as a wrapper packages and will download the Flash Player from Adobe. It is a Netscape/Mozilla type plugin. Any browser based on Netscape or Mozilla can use the Flash Player such as
 
    Mozilla-Firefox
    Iceweasel
    Iceape
    Galeon
    Epiphany
    Konqueror if konqueror-nsplugins is installed.
 
Installation
 
Open a terminal and edit the file /etc/apt/sources.list using a text editor and make sure following line exists:
deb ftp debianorg/debian stable main contrib non-free
Save and close the file. Type the following command:
$ sudo apt-get update
Next, type the following apt-get command to install flash player plugin:
$ sudo apt-get install flashplugin-nonfree
OR
# apt-get install flashplugin-nonfree