yuptude is a tiny bookmarklet that you can use to speed up or slow down HTML5 videos in your browser. When activated, yuptude adds a small control panel that you can use to manually adjust the playbackRate for all videos on the current page.
It works on many popular sites across the web: Vimeo, Netflix, YouTube, Ted, Facebook, and many many others. Use it to watch presentations in a fraction of the time or experiment to find other amusing applications.
And if you discover something fun or useful, share it with me at @saypepck on Twitter.
yuptude uses the bookmarklet NodeJS module from mrcoles to package itself for use as a bookmark.