I would say make Firefox as light and fast as possible by keeping ALL developer tools as addons. Most users aren't going to need them at all, so it's just eating up space for no reason.
I personally prefer Firebug over Inspector, so I would rather see you throw more resources into integrating it fully with FF.
That new Inspector thing is really annoying. I always accidentally open it instead of Firebug. From a developer stand point, Firebug stills beat all other browser dev-tools by a mile and is the main reason I still have Firefox on my dashboard.
You can turn off the built-in Inspector by going to about:config. There's an option in there (I forget the name of it off the top of my head... probably something like "inspector"!) and you can change the Boolean value to 0 and it will no longer appear in the context menu.
> Firebug allows you to disable the builtin Inspector button.
I believe the parent was saying it should be a joint effort and all the resources should be pooled into one. I prefer Firebug as well and would love to see it get better, faster.
I personally prefer Firebug over Inspector, so I would rather see you throw more resources into integrating it fully with FF.