I Need FireFox Extension to Download YouTube Videos

Project Description:
I need a FireFox extension plugin that will download and convert videos from FLV to AVI, MPG, MPEG, MP4, MP3 and MOV

What is FLVEO.com

FLVEO’s primary job is to download to your disk the videos that are playing in Web pages, in their original format ie… FLV files from YouTube, Google Video, MySpace Video, DailyMotion, MetaCafe, Imeem.com, Vimeo.com, PornoTube.com,

Unfortunately, the native format (generally FLV) is often not very convenient when it comes to playing back the videos, on either your home computer or a hand held device, burning them to a DVD or reworking the movie.

With the FLVEO Video Conversion feature, you can very easily select one or more videos that lie on your disk or the web page and choose a pre-defined output format. The program will process the movies in background. Even better: you can setup the FLVEO extension to automatically convert the videos as soon as they are saved by FLVEO. You can even specify conversion rules (which site, which original media format) to be processed with a given set of parameters.

How does FLVEO work ?

FLVEO doesn't do the conversion by itself: this type of job is not really suitable for a Mozilla extension. Instead, it relies on the well-known FFMPEG program to do the conversion task, and provides the necessary glue to make it simple and convenient for FLVEO users.

FFMPEG is the most powerful video conversion utility. In fact, this is the back-end program used by most video converters on the market.
So I need two things:

1. FireFox extension FLV Downloader
2. FLV file Converter

Both 1 and 2 work together.

On Windows, user can install FLVEO downloader extension and use the FLVEO Converter application to make it easier for the FLVEO Downloader/FFMPEG relationship. Both of these will work together.

Who ever gets this job will have a stable job as this application-firefox extension requires updates.

To better understand this project, see a sample software that you can clone.
http://www.downloadhelper.net/conversion-manual.php