Greasemonkey is without a doubt one of the most useful Firefox add-on and also a very powerful tool for customizing and improving the Firefox functionality.
Without going into too much detail, I will introduce you one of the most popular scripts on userscripts.org (the Greasemonkey scripts website). Download Youtube Videos as MP4 is the name of the script. And as you’ve already noticed it is a script that allows YouTube users to download any video in format of MP4 media files or FLV.
What makes this script is to insert a button on the download page appears the video file you are looking for. Download options are depending on video quality just like the picture below.
Download the Greasemonkey Youtube Download Script
You can also read more info about GreaseMonkey features and also download the add-on by checking this article.
[...] This post was mentioned on Twitter by Technolik, Web Design News and Web Development, Web Magazine. Web Magazine said: Greasemonkey Youtube Download Script: Greasemonkey is without a doubt one of the most useful Firefox add-on and al… http://bit.ly/akNp1z [...]