Embedded yt links doesn't load the addon

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Firefox isn't loading sponsorblock in www.last.fm because it's embedded, I tried clicking on the refresh button but it doesn't work.

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2. Since they are songs, most songs have the final seconds which sometimes goes to over a minute of basically a static sound (still unclassified as non-musical), could you add a category for this? I believe some people for some strange reason wouldn't want to miss it, and segmenting them as non-musical instead of a new category would cause problems in the community.