suggestion:
A keybind to disable all the player ui, so when you mouse over it nothing pops up, this would be useful for people who find it annoying seeing the ui pop up when they just accidentally moused over it for a couple of milliseconds (me) as well as people who want to try and take a screenshot of the screen in full-screen by using this extension https://chrome.google.com/webstore/detail/take-webpage-screenshots/mcbpblocgmgfnpjjppndjkmgjaogfceg and not have the ui get in the way. (also me)
Other than that I really enjoy this extension the best feature for me is definitely the roll credits and skip after feature, closely followed by the elapsed time feature. Oh, also the GitHub page has changed locations I think, the link here and in the extension itself redirect to an empty page.