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

Qqen
Tignit n uzegrir

Iceggiren i YouTube Speed Controller

YouTube Speed Controller sɣur Samuel Li

4,1 n yitran ɣef 5
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Tiririt sɣur Samuel Li

Tiririt n ineflayen

yeffeɣ-d deg pred 5 rokmi
You can set any step size, down to 0.01. (Right click icon > Manage Extension > Preferences).