Full Movies : 1-click Youtube downloader installed but button missing

1-click Youtube downloader installed but button missing

Hi,

I have had 1-click Youtube video downloader addon installed for a little while now and it has always worked well. However, recently I tried to change to a different addon (in fact several different ones) but the Download button then disappeared. I have since re-installed Firefox and returned to 1-click Youtube Video downloader, but still when in a YouTube video page the Download button is missing, no matter which videos I select.
I would much appreciate some assistance as I use the YouTube Video download option a lot!

Please help.

I didn't find the right solution from the Internet.

References:-

Workforce Analytics Example

Thanks!
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