I am trying to figure out a complicated interaction between the browser and a couple of extensions, to see what's going on, and how the browser chrome (and its CSS) is being generated. I know it's there and possible, but I've tried all I can find, no luck.
I'm getting nowhere, and after 6 or 8 hours (whole day gone) I've tried everything I can find online. I know it's possible to view Firefox's browser object hierarchy - it's often needed for development. I've tried the inbuilt Inspector and a few other tools.
I hope it's on-topic here, I need help to figure how!