The are already pretty amazing - but perhaps you can help to them even better! Even if you primarily use another browser's dev tools!
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If you use CSS and/or JS:
I made a 1-page survey that shows off some of my mockups for potential new Firefox DevTools features 
. If you have 5 minutes to share your reactions, I'd be so grateful! (All browser users welcome!)
surveygizmo.com/s3/5458599/v19
. If you have 5 minutes to share your reactions, I'd be so grateful! (All browser users welcome!)
surveygizmo.com/s3/5458599/v19