Is it possible to view HTML source auto-formatted in Firefox

View Source Chart 2.7

[UPDATE]: original link was broken, here is the website: http://viewsourcechart.com/

Right click -> View source chart

This is what I get for the Google home page HTML source:

Before:

After:

From here

View Source Chart Graphically displays source structure.

JSView 2.0.5 Displays information on page external files.

HighlightAll Highlights identical elements in the code.

Html Validator Validates HTML of the current page.

View Formatted Source Shows source structure.

SourceEditor Allows to edit code and view the results.

I normally use Firebug for debugging html output.

This allows me to se the html as it's rendered by the browser, together with the well-formatted source in Firebug. I can also inspect elements in the displayed html and see where they come from in the originating html source.