1.3: As a stopgap measure, greying out watched thumbnails can now be disabled by opening developer console (Ctrl + Shift + K on Firefox, Ctrl + Shift + J on Chromium and derivatives), typing localStorage.setItem("dontGreyOutWatchedThumbnails", true) then pressing Enter, and reloading the page. I might make a GUI for it in the future.
1.2: Fixed videos being incorrectly marked as watched. Also, watched videos are reverted to being clickable (this was a bit confusing), but still greyed out.
1.1: Watched videos are now non-clickable and greyed out.
