DownloadHelper: the easy way to Web videos. Download tons of videos from most of YouTube like sites.
Congratulations, you just installed Video DownloadHelper 5.6.1
This is the latest stable version for Firefox
You may want to have a look at a short documentation about how to do things with Video DownloadHelper 5.
For documentation regarding video conversion, check the conversion manual.
If you have questions and issues, check this forum. Just please, make sure you take the time to make a little bit of search before asking your question.
If you want to contribute to the Video DownloadHelper project, you can do so by making a little donation.