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DownloadHelper not working with Youtube - solution
1) press: Ctrl+Shift+Del to go to History cleaning. 2) select timeframe: all 3) mark: Cookies, Browser Cache, Active Logins, Offline Data, Site Settings. (you can also mark Search History but it is not neccessary) 4) press: Clear button.
It solved the problem of downloading 0kb files instead of YouTube videos.
(with Firefox 25.0, DownloadHelper 4.9.21)
All Replies (2)
If you do not want to clear anything from the search history you can also press Shift+Ctrl+P to go to private mode. (DownloadHelper works fine in private mode even when it does not work in normal mode)
Thanks for letting everyone know that you found a couple of solutions for problems with DownloadHelper at YouTube. I take it that you meant the "Video DownloadHelper" Firefox extension available here:
Another good place to post this information would be on the above webpage, by using the "Write a review" button.
I'm going to close this question and mark it "off-topic" since you weren't actually asking for help with Firefox. Thanks again.
Modified by AliceWyman