Country selection UI in 4.7.x negative feedback
Terrific! I found a work-around, and here it is! Using Firefox web browser, with the "Web Developer" tool bar extension, select Disable \ Disable JavaScript \ Disable All JavaScipt. Then reload the above specified URL. That will load the page WITHOUT the AJAX / JavaScript multi-select controls... and leave the basic HTML list controls. I was able to quickly select all the countries, and I am cruising along wrapping up this upgrade.