Here's the site with the userChrome for ad blocking:

http://texturizer.net/firebird/tips.html

Lots more things to play with there - I originally found the site while looking for a way to disable the way Mozilla automatically resizes images.

One cool setting is:

user_pref("nglayout.initialpaint.delay", 0);

This is the time that Mozilla waits after receiving data before trying to render a page. This is normally 250s, but setting this to 0 seems to speed things up a bit.

Gareth