FlashGot is a extension works with Firefox and Thunderbird . FlashGot turns every supported download manager into a download manager for Firefox. It helps the firefox or Thunderbird users to use there download managers which are not supported by firefox or Thunderbird. This tool helps to grab the download manager and start the downloads multiple files with your download manager.It also Grabs the flv videos and make the download manager to force download it. As far from my view FlashGot is a powerful tool .
Want to try the ADD on check the link – http://flashgot.net/