The command-line is a pretty cool feature, but the debugging tools in general are still lagging pretty hard.
For example, as far as I can tell, even Aurora has “Pause on exceptions” but no “Pause on uncaught exceptions”. Chrome has a much nicer script navigator, and pretty-printing for minified scripts, but Aurora has the classic “one big list of scripts” with no pretty-printing. Etc.
I couldn’t agree more. I use Chrome almost all of the time for web development. However, as you mentioned, that command-line feature looks pretty awesome.
I wonder why the Mozilla team have not only built the Firebug extension in Firefox core and expanded on it rather than compete with it.