Here’s a trick I learned using MT regularly : Use VERY short names for your media queries (in the Edit Media queries panel) and then (on a normal screen), you will be able to open all tab at the same time per CSS property you need to edit.
If you use long and detailed names, the tabs display will end up in a mess that you will not be able to manipulate.
batsteek – thanks for sharing your solution, I think short labels are the way to go. But Abland – dashicons!? I wasn’t even aware of these (but shh, don’t tell anyone that). Did you have much luck with those? I will look into the general idea of adding graphical elements to the media query tabs if dashicons aren’t the way forward.