[mijoharas]

How do you pop the dev tools up on that window?

I tried but can't (same thoughts as you, without verifying it myself, not gonna sign in...)

Hitting F12 or Ctrl+Shift+C on the popup page do nothing.

EDIT: chrome on linux Version 59.0.3071.86 (Official Build) (64-bit)

[travbrack]

Using Mac Chrome I was given the option to "inspect" on the right click menu.