Note from Mozilla:
This add-on has been discontinued. Try Video DownloadHelper
Like the VideoDownloader extension, but up to date on changing sites & supporting new sites constantly. Sick of using the VideoDownloader extension that is outdated, doesn't work with half the sites it used to & doesn't work with ANY of the new sites? This extension keeps up to date on video sites when they make updates to stop from being downloaded and is constantly adding new sites. It just adds a small icon to the status bar of your Firefox browser. Just click it to download the video you are watching!