-Browser : Google Chrome (recommended), Mozilla Firefox, Safari
-Sense
-Internet (of course)
Instructions :
1. Download this
Chrome Below v.36 : Click Here
Firefox v.13.0 and later : Click Here
Safari : Click Here
(Chrome Instruction)
2.After you download it you press the arrow
click show in folder
4. Go to tools --> Extension, then you drag the helper_last.crx file to extension
Install it.
5. If you already install it Restart google chrome
6. Open youtube then choose the video you want to watch then it will show this
Press download then choose the format and quality