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Youtube thumbnails issue on Firefox For Android

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I tried to use youtube thumbnails like adding a layer on thumbnails, and changing the youtube logo... Suddenly it doesn't work, tried combinations from DOM to everything. As currently expected, you can see the PC version on https://github.com/Omarplayz233/pearify-firefox

I tried to use youtube thumbnails like adding a layer on thumbnails, and changing the youtube logo... Suddenly it doesn't work, tried combinations from DOM to everything. As currently expected, you can see the PC version on https://github.com/Omarplayz233/pearify-firefox
Attached screenshots

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