Script Summary: Inserts a download button on YouTube video pages
This script works with Firefox/Greasemonkey and Chrome! (Opera untested, may work)
Version 1.5 and above work with the new YouTube interface introduced around mid-December 2012. If you have not received the new YouTube interface, please use version 1.4.
All versions up to 1.5 were minified using YUI Compressor. All versions from 1.6 and above were minified using UglifyJS2.
Please see the GitHub repository linked as the Script homepage for original unminified sources.