1. video to mp3
plus addons :Firefox / Chrome Addon 1.0.7
The addon adds a link on YouTube, MyVideo, Clipfish, Dailymotion and Sevenload Video pages to this service and converts the video directly.
If you have problems with the addon or if you have suggestions to improve this please be free to contact us.
You can get the addon also from the Mozilla Addon Page.
2. clip converter
3.FVD Suite software
it integrates with firefox ie has its addon - toolbar for ff