You made me curious, so I tried it. I could only get the option in Firefox, of which I'm running Aurora. IE, Safari, and Opera wouldn't load WebGL, I'm just run

You made me curious, so I tried it. I could only get the option in Firefox, of which I'm running Aurora. IE, Safari, and Opera wouldn't load WebGL, I'm just running whatever the current mainstream version happens to be. Chrome, again current mainstream version, loads the WebGL but no save image option.