I installed this only because the video resolution can be displayed on the thumbnail.
I also have youtube+ which has other features I like, but lacks this. There is also youtube center, but that one is old now and many features are not fully working, plus it slows down my browser significantly.
I'd like to suggest colored definition labels for different resolutions.
for example if it is 720p make it green, and if it's 1080p make it red.. etc..
And movable labels too. I like this to be shown in the top left.
Because of this I made this css stylesheet, there is colored labels and slightly bigger text too:
If you want, you can include it in your script. (I know it's not perfect, but that's the best that I can do from here.)
And anyone who wants it right now, can just install it as a userstyle in stylish.
PS. I have re-added the "white overlay on watched videos" (not with opacity btw.)
Also, is it possible to load the definition labels as soon as the page loads / video thumbnail appears?
Because right now, it takes quite some time to load them..... I don't think it was this slow in youtube center though.