Why Downloadhelper does not work with Youtube?

I used the add-on video Downloadhelper years on my laptop without a problem. I noticed about three days ago, that he did more work with Youtube videos. Rotation icon still works, and when I click it, it still gives me the choice of file type to download. However, when I click on my choice, the green arrow shows the download process, but happens ' 0 bytes"for all types of video.

I don't have problems to download videos from other sites I've used before, just from Youtube.

Also, I am able to use Downloadhelper with Youtube on my other computer without problem.

Can you please help? Thank you.

Google/Youtube are trying to block the addons like these, maybe its been blocked from youtube, I would try FVD.
https://addons.Mozilla.org/en-us/Firefox/addon/Flash-Video-Downloader-YouTube/

Tags: Firefox

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