Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
I should say it's finally good news for all Hotmail user, Yes really atlast Microsoft enables Web based IM for Hotmail users. The question arises on everyones mind is why Microsoft delays enabling web based IM ? This feature has been enabled years after Google and Yahoo.