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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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Hi

To clarify, are you trying to make an add-on for Firefox for Android?

Helpful?

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yeah, but even i added the url in permissions using the manifest file (*://*.m.youtube.com/*), not working at all, i tried several times to fix the problem, and tried BOTH publishing the pc version and mobile for testing, and the web-ext package in nodejs, they're both not working, even the owner mentioned that it doesn't display at all, i also tried building it from source, the pc version works, but the mobile version still not working.

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