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

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Iceggiren i Simple YouTube to MP3/MP4 Converter and Downloader

Simple YouTube to MP3/MP4 Converter and Downloader sɣur UsualBeings

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Icegger-it Aseqdac Firefox 13529950
sɣur Aseqdac Firefox 13529950, 8 jierren lyn
There are some problems of using this after the recent update of Firefox version. It seems that this extension is slowing down YouTube (with a yellow bar error message)