UPDATE (13 Jue 2017) : The addon has been updated to v 9.15, get it from here - https://www.yourvideofile.org/download.html.
UPDATE (11 Sept. 2013) : The addon has been updated to v 7.1 and is pending Mozilla's review to go public, you can still download the latest v 3.5 from Mozilla at - https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/, this update features the all new instant single-click, direct high-quality (192kbps) Youtube to mp3 downloads.
UPDATE (17 Sept. 2010) : The addon has been updated to v 3.6 and is pending Mozilla's review to go public, you can still download the latest v 3.5 from Mozilla at - https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-download/, this update makes it work again with newest Youtube changes which broke the video downloads.
An updated version of simple, fast and easy to use popular Firefox Youtube video downloader addon "Easy YouTube Video Downloader 1.2" is now available for download, the addon adds non-intrusive video download links in FLV, 3GP, MP4 and HD qualities next to video on Youtube pages.
The latest version features new button style, adds support for FLV download format and now displays HD download option only when available, with current release the addon is now Firefox 3.5 compatible.
An updated version of simple, fast and easy to use popular 
There are numerous tricks, tools and online sites to 