Add YouTube Video Progress
Add progress bars (or dots) at bottom of YouTube video and progress text on the video page. On the progress text, the current video quality will have a "+" suffix if there's a higher one available. Hovering the mouse cursor onto the video quality text will show the current and available video quality IDs and short description.
Embedded YouTube Video Quality Preference
Set initial video quality for embedded YouTube videos based on a set of preferred video qualities, as well as minimum and maximum video qualities (configured in the script).
More YouTube Hotkeys
Adds more keyboard shortcuts for YouTube. The list of all new shortcuts is added into new "More Shortcuts" section on YouTube's "Keyboard shortcuts" popup which can be accessed via "?" or SHIFT+/ key (on U.S. keyboards).