Youtube Watch Later Sort by Duration

Youtube Watch Later playlist has always lacked a sort by duration function, and without external access, services like YTPlaylistSorter from CarterRJ don't work either, thus introducing this code, now migrated to work on TamperMonkey/GreaseMonkey.

The original code was gratefully contributed by SunnyWiz, but it was broken by the time it got to me. I just fixed it and added some features to make it easier to use.

After adding this script, two additional buttons will be shown below. You should use this plugin without any other plugin to prevent slowdowns.

You can find the code to this script here, and submitting feedback at the Github Gist will lead to faster responses.