It's an extension for Edge and Chrome that automatically records the time of the video. So if you leave the page, close the window, change video without doing anything in particular, as soon as you return to the video, the time will automatically be reset to where you were.
Download latest release from here and install it.
Extract the .zip folder to a folder, put it where you want it
- Go to
edge://extensions/orchrome://extensions/and enable Developer Mode
- Click on
Load unpackedand select the folder where you extracted the .zip folder
You don't have to do a thing, the extension will save the video time automatically. Enjoy :)