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> there is a way to open dev tools FOR the dev tools window

I did not know that.

Open DevTools > pop it out into a separate window > Ctrl+Shift+I (on Linux) > Ctrl+Shift+I ad infinitum > enjoy devtools-ception.

You can do the same in Firefox. It's under Tools -> Web Developer -> Browser Toolbox.

Okay, obvious question: are they portable enough that we could just wholesale import them into Firefox?

I'm honestly not sure. It would be cool to attempt that, but I have a feeling at least the chrome dev tools use internal/privileged APIs