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

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Iceggiren i Video Blocker

Video Blocker sɣur Aseqdac Firefox 6112461

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Icegger-it Aseqdac Firefox 12691542
sɣur Aseqdac Firefox 12691542, för 6 år sedan
For Mozilla users;

https://addons.mozilla.org/en-US/firefox/addon/youtube-cleaner/

Works great. All you need to do is just clicking the "X" that appears on the video thumbnail.