[UPDATED: Thursday, February 28, 2008 at 8:02:17 AM]
This gives you the benefit of generating a label and a value all on one line. I find the syntax very easy to read in the Firebug console and it keeps everything on one line—just the way I want it. The output will look like:
Hopefully someone else will find this tip useful.
UPDATE:For those of you who want a Firebug to output a hyperlink to the line that invoked the message, you might want to use console.debug() instead.