Important update: it appears Firebug leaks memory. You'd probably wanna disable it when you're not using it.
I've been using Firebug as a problem-solving tool for quite a while. The latest release has also made it an awesome tool for getting immediate feedback on changes to the HTML.
Want to edit a page?
1) Bring up firebug (F12) and select the element you want to modify:
2) Click the new "Edit" button on Firebug's toolbar. The element's outerHtml will be loaded into the editor:
3) Edit freely. The browser will be updated as you type!
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