To use these add-ons, you'll need to download Firefox.

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Iceggiren i Enhancer for YouTube™

Enhancer for YouTube™ sɣur Maxime RF

4,7 n yitran ɣef 5
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Icegger-it Aseqdac Firefox 13595652
sɣur Aseqdac Firefox 13595652, ien jier lyn
Works perfectly fine with Waterfox too, using 2.0.124.2 on Waterfox G6.0.14 (64-bit).
Manifest needed a tiny edit :)