YouTube recently pushed out a change called "Inline Playback" which, instead of playing a short GIF of a small section of the video when hovering over a recommendation, the site will start playing the video from the start without sound. This not only r###lts in a slower and more clunky experience, it can also affect your future recommended videos because the video will actually be added to your watch history.

This is a very basic script I wrote to revert to the original behavior without needing to be logged in.