>The built-in devtools with Javascript console in Chrome are a close analog in a web browser, but that is limited to the document you are viewing, and you can't control the entire browser experience from that console.
You cannot use those devtools to customize the devtools themselves; can you?
I'm asking to make sure I understand -- I'm not trying to be argumentative.
Actually, you can use DevTools to inspect DevTools. Hit option-command-J to bring up devtools, make sure it's in "window mode," i.e., in a separate window from the browser itself, and then hit option-command-J again to DevTools that DevTools.
You can actually just keep recursing and inspect the previous inspector ad nauseam...
You cannot use those devtools to customize the devtools themselves; can you?
I'm asking to make sure I understand -- I'm not trying to be argumentative.