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Here is the simple and easiest way to download Youtube videos.This will be download videos in MP4 format or the HD video if available.

Step one:

Save the following link as a bookmark by dragging it to your Bookmarks tool bar (Links bar) (in Firefox, Safari) or right-clicking and adding it to your favorites (in Internet Explorer, Opera)

Get Youtube Video

Step two:

Go to youtube.com and when you want to download a YouTube video, just click on the bookmark button. (as bellow image)

If the video is available in HD, the bookmark and the script download the HD version