How to revert to old style firefox inspect tool?

Hi, I am a developer. Firefox recently changed the way the Inspect tool highlights the element in question. Instead of a solid box will translucent fill for the content, padding and margin boxes, it only shows the outline of those boxes and it's very problematic to work with. In the attachment I am highlighting the words "Shipping and Return Policy" and the light blue, purple and yellow outline represent the content, padding and margin boxes respectively. How can I revert back to the old style where it shows the translucent boxes filled with respective colors instead of just the outlines.