There are many online services that help you to download YouTube videos, many PC programs that help you to download YouTube videos. But if you have installed Firefox browser than you do not need any other service to download your favorite videos in your hard drive, only you have to install add-ons. I searched and found 16 Firefox add-ons that help you to download videos from YouTube and other YouTube-like sites in various formats.

You do not need to install all add-ons but which you like you should install. These add-ons are for Firefox 3.5 and upper versions:

Here is a list of Firefox add-ons to download YouTube videos.

(1) Easy YouTube Video Downloader
Download youtube videos with a single click in your favorite format.

(2) Fast Video Download

Download vodeos form youtube and youtube like and many other sites.

(3) NetVideoHunter Video Downloader

Download videos from youtube and youtube like other sites.

(4) Flash Video Downloader

Helps you to download flash embedded videos from youtube like sharing sites.

(5) MP4 YouTube Downloader

Download youtube videos in mp4 format.

(6) YouTube Video Downloader

Download youtube videos in different formats.

(7) Youtube Downloader

This add-on allows you to download videos from youtube like sites and music from last.fm, Pandora etc…

(8) Ultimate YouTube Downloader

This add-on creates lins to download youtube videos in FlV, MP4 and 3GP format.

(9) Video Downloader plugin

This a flash player come video downloader .

(10) Convert and download online videos

Convert and download videos from youtube like sites in one click.

(11) FlashCatch

Download youtube and other sites videos in one click of button.

(12) YouTube to MP3

Download Youtube videos in mp3 format.

(13) Download YouTube As MP4

This add-on helps you to download youtube videos as mp4 file format.

(14) Download YouTube Videos as MP4 and FLV

Download YouTube videos as MP4 and FLV.

(15) 1 Click YouTube Video Downloader

With this add-n you can download YouTube videos in one click in mp4, flv, 3gp and in HD, you can download videos for iPod too.

(16) YouTube Download

As its name suggests, you can download any youtube video with a single click.