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 13342929
sɣur Aseqdac Firefox 13342929, 7 jierren lyn
This extension used to work great but only up to a month ago (today 9/22/18). I installed it in my Firefox. Nowadays it works about 30% of the times and I basically gave up on using it.

It WAS a GREAT tool! Not anymore!!!