Downloads YouTube videos in all available formats (FLV, MP4, WebM, and 3GP) with video quality of your choice with firefox easily.Follow the steps.
1.YouTube™ Video and Audio Downloader :: Add-ons for Firefox
first you need to download video and audio download addson for firefox.You can download here
2.Now open Youtube
Open youtube on firefox and you will see youtube icon on top of the browser and also download option below of the video.
3.Open Youtube Video You want to Download
Now open youtube video and click on youtbe downloader option.You will see list of all available formats.Click on any format in which you want to download.
4.Download With IDM
To download the videos with IDM, Right click on the video link and click on copy link location.
Now open idm and click on add URL and ok to download.Now you can download the video faster with IDM.