Firebug is certainly a wonderful tool for javascript debugging; I use console.log() extensively.
I wanted to know if I can leave the Firebug-specific code in production.
I have had many a headache caused by this.
I use console.log() a lot, and until recently, found that it would cause the entire JS code to fail in versions of FF not using firebug.
I usually run a find before going live, and commenting it out.
D