[GTALUG] Request for demo on Firefox's Web Developer capabilities

Hi all, For network tracing of something that is initiated by browser, I recently discovered Firefox's Web Developer > Network which is more immediate and convenient than Wireshark's Analyze > TCP Follow. But, I'm not a "web developer" and don't know what most other tabs mean or where to use them. So, I would like to see a quick demo or tutorial of Firefox's Web Developer capabilities, say 20 minutes max. If you can cover other browser's debugging capabilities, that would be a bonus. -- William Park <opengeometry@yahoo.ca>