The playspeed chrome plugin gives you control over how fast or slow a video is played on YouTube, from 0.25x to 2x speed play.
Update: 16/8/2015.
Now works with updated version of youtube player This chrome plugin allows you to control youtube video speed and rewind videos.
Speeding Up Examples - Watch those talks & lectures twice as fast - Slow down instructional videos so you can really see each detail - Quickly scan through videos for the most relevant section rewind videos by 30secs, 10secs, and even 2 secs.
- Rewind video to re-watch that sport highlight - go back 10 secs to jot down those notes - Rewatch in slow motion how something works Please let us know how we can improve this app www.playspeed.co