You can use these JS as bookmarks in firefox:
javascript:location%20=%20'http://www1.ngtech.co.il/redbot/webui.py?uri='+encodeURIComponent(location);%20void%200
javascript:location%20=%20'http://redbot.org/webui.py?uri='+encodeURIComponent(location);%20void%200
One is mine and the other is Mark Nottingham site.
These redbot systems will help you analyze servers sites and objects.
If you will look at the bytes level of every page you will see something
else.
as an example try to get into this site:
http://www1.ngtech.co.il/redbot/webui.py?uri=http%3A%2F%2Fwww.djmaza.com%2F
Browse this site and see how a site should look like.
I would like to hear if you think this site design for cachablity can be
done better.
Regards,
Eliezer