I'll definitely try that out. I use FF at home but I'm basically forced to use Chrome at work. I have a few javascript scripts I run through the browser URL, and as far as I can tell, this doesn't work with FF.
I think either greasemonkey or firebug extensions would do what you are looking for. Remember, firefox is all about extendability. They want to only provide you with the minimal features which most users need and let you choose what features you want to add.