During testing and debugging your site you might find useful a
greasemonkey script I wrote that throws an alert when a page is loaded in Firefox. The script counts several details of the page source and put them in the alert box.
The counted details are:
CSS files attached
Script tags
Tables
Table rows
Table cells
DIVs
H1
H2
H3
Paragraphs
Spans
Links
Images
If you don't want to use the script with
greasemonkey, you can download the file and copy the code of the script to embed it in a skin for testing or anything.