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Video Downloadhelper is no longer working. Firefox and VDH are updated. What can I do?

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I have updated Firefox and Video Downloadhelper Extension/add-on and the extension now is gray and does not recognize videos on any site, but specifically youtube. How do I fix this?

I have updated Firefox and Video Downloadhelper Extension/add-on and the extension now is gray and does not recognize videos on any site, but specifically youtube. How do I fix this?

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What does the developer of VDH say? You should contact him first.