# 1. Install the Greasemonkey Extension for Firefox.
# 2. Right-click this .js file and select "Install User " (if you don't see that option try step one again)
# 3. Now on every youtube video page there should be a red bar at the top, that says "Save As" to download Flash video. (see screenshots here)
# 4. Right click the text in the red bar, select "Save Link As," and save the file as a .flv file. Firefox will rty to save it as "get_video.php," you need to change the ".php" to ".flv," and change the first part to whatever you prefer.
# Now you need to either download a media player that runs .flv files, or download a program that converts them to other file types. Here are links to both:
FLV PLayers
FLV Player
VLC Player
FLV Converters
Riva FLV Encoder
Total Video Converter