Works to change the canvas hash, but the settings page is missing so I can't enable auto changing hash or disable the popup every time a site reads the canvas ID.

Edit: Turns out the settings button is there but cut off since the contents of the settings panel is more than 280px high and the author of this extension set body height: 280px. Please set body {overflow: hidden scroll;} instead of overflow: hidden or set the body height to greater than 280px so the settings button won't get cut off.