Recently web-tool that I was using to download webm video from YouTube for offline courses, so I asked my Twitter friends to help find other way, without toolbars and apps.
Youtube HTML5 video download without toolbars and extentions? #help
— Denis Laskov (@it4sec) August 22, 2012
and here is response after few hours from Friend of mine, Mohab Ali aka 0xAli:
— Mohab Ali (@0xAli) August 22, 2012
On his site You can see the string You need to past at address bar when You at YouTube video page
this solution working, tested Opera and IE.