Firebug for Firefox
A developer friend put me on to the Firebug extension for Firefox a few months back and yesterday it proved invaluable in identifying some troublesome code on a live web page. I specifically used Firebug to track down which classes and IDs in a blogger page template were causing my layout problems and it worked an absolute treat.
Folks, if you haven’t already plugged in the Firebug extension/add-on for your Firefox browser then I recommend you give it a go.