Version 1.1.2 - "Unable to retrieve video metadata" (with Firefox 82.0.2, released October 28, 2020)
Worked perfect 'til previous version, last used on October 26, 2020 (with previous Firefox)
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Installed old version 1.0.9 again (with Firefox 82.0.2):
"Error parsing info: Cookie header used in request, but unable to find YouTube identity token"