How to download youtube videos on PC/mobile

Although there are many methods to download Youtube videos but the one that I have laid out here below doesn't need any specialized software or plugins installed it works on all browsers (PC/mobile ).

First of all open any video you want to download go to address bar and add 'ss' (without quotes) before youtube.

eg. http://www.youtube.com/watch?v=g-lsHn8gP3I
     http://www.ssyoutube.com/watch?v=g-lsHn8gP3I

Screenshots of the whole process given below.

Choose resolution and click download.

Lastly select save file and press ok.