YouTube-Speed-Controller от r.e.l

This add-on adds small speed controller icon over YouTube video allowing user to increase and decrease speed (from 0 to 10). Feature hides in mouse out.
After download and install add-on for speed will show up at the top right corner of the video - click the >> and << to change speed.
>> button will increase speed by .25
<< button will decrease speed by .25
Feature will effect only the video speed.