CS50 2x is a Chrome extension that lets you play (some of) Harvard University's videos at 2x speed (and slower and faster). Offers keyboard shortcuts, custom speeds (between 2x and 3x), and a workaround for DCE videos. CS50 2x also lets you download videos to watch offline with other software. This extension only supports videos at these domains: canvas.harvard.edu cm.dce.harvard.edu icommons.harvard.edu isites.harvard.edu live.cs50.net matterhorn.dce.harvard.edu CS50 2x does not support Mediasite videos (since Mediasite's player has its own built-in 2x button). To activate extension on a page with a video, simply click extension's icon. Or hit Shift-Alt-2 (on PCs) or Shift-Option-2 (on Macs); change at chrome://extensions/ via "Keyboard shortcuts." To slow down or speed up while a video is playing, click icons or use - and +. To seek 8s back or 30s forward while a video is playing, click icons or use left arrow and right arrow. Report any problems to firstname.lastname@example.org! Written by CS50's own Dan Bradley '14, Cheng Gong '16, and David J. Malan '99.