It boggles my mind that I seem to be the only one annoyed by the modal interaction style that modern browser devtools inherited from Firebug.
I see people constantly talk about how they can't imagine working without multiple displays because it affords the ability to put so much on the screen at once. So they say. Meanwhile, I do everything on a ~13 laptop screen. But I'm the one who has to point out how crazy it is that you can't inspect the style rules of two elements at the same time?