Great extension for Ultrawide(21:9) users.
The only problem I have is with the stretching mode
Even if I set in Extention Settings
Enable this extention: Always
Default stretching mode: Basic
I even set in Site Settings
Default stretching mode: Basic
I am watching full screen video in youtube and its not stretched so I need to exit full screen click Ultrawidify video settings and click on basic and only then enter full screen again and it stretched, so even though its experimental it works but exhausting since its not automatic and there is no keyboard shortcuts for stretch mode.