UnPlug is a FireFox extension which lets you save video and audio 
which is embedded on a webpage. 

UnPlug scans web pages and tells you where things like media players 
and other embedded objects are getting their data from, and displays 
it as a simple hyperlink: 

in most cases, you can then follow the simple download link 
to save the media file.

It doesn't need to connect to external sites to find where media 
is kept - but it can do if you want it to by downloading the results 
from KeepVid and VideoDownloader. 

UnPlug will search, ask and even guess where media is on a website, 
presenting its results in an easy-to-use results page. 

https://addons.mozilla.org/fr/firefox/addon/2254

http://unplug.mozdev.org/

http://www.ordiecole.com/jeux/index.html
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http://www.ordiecole.com/jeux/unplug.txt