VideoScan

Speed up or slow down video playback in the browser. Includes convenient controls to pause, skip forward/back by small increments (1 second, 0.1 second). Use keyboard or mouse to control video.

Speed up presentations or instructional video, to scan for moments of interest, save time.

Slow down videos to analyze physical events, sports plays and athletic techniques, etc., or just to make the show last a little longer!
Works on "most" sites (Youtube, Netflix, Amazon, etc.) but *not* on Google PlayStore, however purchased videos can be viewed on Youtube. Doesn't work on advertisements or videos hosted inside iframes.