Related links:

• Firebug blog : Firebug Metamorphosis
• Introducing the Web Console
• MDN: Using the Web Console

Very bare bones in Firefox 4 beta 6, and in no-way a complete Firebug replacement, but I appreciate that it’s at least there. Initial irks:

• Without the console open, console.log() still breaks your scripts
• Cmd + Shift + K to open. Would have been nice if it were unified with WebKit’s Cmd + Opt + I.