I got this because Youtube broke the video player for me, and while it fixes the issue I got it for (along with several extra features), the player does not display the thumbnail for videos that do not autoplay (i.e. when a video is opened in a new tab, or when the page is refreshed). I know thumbnails are primarily made to entice people to click on a video, but having a video that did not autoplay default to the frame of the video I was on instead of the thumbnail is really dull. The odd thing is that thumbnails ARE displayed on the glitched pages that have this add-on partially installed, which were open when I installed this add-on. Anyway, an option to display thumbnails on the video player itself would be nice.