Handy HTML5 Document OutlinerDismayed (again) by the lack of valid HTML5 document outlining in Firefox's Web Developer add-on (come on Chris!), I hunting around found this, a "bookmarklet" you slam into your (surely visible) bookmarks toolbar and <click> to get a cute HTML5-capable document outline hovering over your page.
Here's that URL again..
Download the HTML and drag the bookmarklet into your bookmarks toolbar (or grab one of the specialized versions). Voila!
From then on, you simply click the bookmarklet and your page's Document Outline instantly appears. Handy.
ps. behind the scenes, the HTML5 update continues..