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

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Iceggiren i YouTube Video and Audio Downloader (WebEx)

YouTube Video and Audio Downloader (WebEx) sɣur feller

3,8 n yitran ɣef 5
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Icegger-it Just Another Guy
sɣur Just Another Guy, pred 5 rokmi
This actually works when most extensions/websites fail, as it's able to utilise ffmpeg and process everything locally.