it's funny that french is default language even though descriptions are english.

for a 5 star you need to add these features:
1- control playback speed with mouse scroll while mouse on top right corner (where extensions ui is)
2- hotkeys like preferred speed (this example is necessary)
3- double clicking on extension's ui enables fullscreen, must be fixed.

i also wonder if this extension is a fork of Igrigorik's.