It shows related videos in all three browsers for me. I don’t want any related videos at all – I just want the video to finish.
https://13art.com.au/product/55x25mm-sterling-silver-labradorite-pendant/
As of September 25th 2018 there is no way to disable the related videos from displaying.
The effect of the change is that you will not be able to disable related videos. However, you will have the option of specifying that the related videos shown in the player should be from the same channel as the video that was just played.