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Pretty swell, but I won't ditch Firefox just yet...I can't do without Firebug, so I'll have at least one FF window, at least during working hours.

(This comment posted via Chrome)

It has a javascript debug/console window that is pretty neat. It has auto completion as well. Go to the page menu item, then the developer menu item.

I recommend using the WebKit inspector, it is actually pretty comparable to Firebug (and in Chrome).

*edit: whoops I hadn't refreshed for a while and I didn't realize this was already answered.