Script Summary: Working as of July 17th 2013. --- A download button will be added to YouTube videos that allow you to download. No java required! Working with the latest YouTube update! Lightweight script that loads extremely fast!
Simple YouTube MP4 Downloader (No Java)
Why should I use it?
This addon does not require ANY java applet which makes it faster than other addons and also much safer as the developer can easily bind malware to the java applet.
Small & Lightweight
Since this script is small your videos will load much faster than having a huge script that loads on each YouTube video. You can take a look yourself by viewing the Source Code of this script.