Works fine on Vivaldi
A quick note to say this script works well for me, thanks so much! I'm using the Vivaldi browser: based on chromium but with privacy in mind. It's made by the team who used to work on the Opera browser...
Some more details of my setup, if it's useful: Windows 10, Vivaldi 2.0.1309.37.
I use the buttons to change status, assign to myself and Quickly reply/resolve. Happy to get involved in testing more...