Firewall or something is strange

Hi!
This is the first time I write here. Seems like a nice forum. Hope that someone can help me. Cause other forums can't.

Here is the problem:

I can't load some websites, some websites doesn't load fully and some websites goes awfully slow. This happens to all the computers beyond my linuxbox with firewall. I've tried browsers like FF, IE, Safari and Opera. Nothing works. For example on http://thepiratebay.org/ it's a logopicture at the top. The computers behind the firewall can't load that picture.. And the site goes slow. And www.99mac.se does not load at all. But on the linuxbox it's no problem to surf these sites with Konqueror or Mozilla.

What's wrong?

The linuxbox runs Debian Sarge and the firewall is monmotha's script using v.2.3.8. I've also tested 2.2.0.

Here is my firewall config:
http://phase2design.sytes.net/~p2d/r...2.3.8-pre9.txt

first of all be sure that the problem caused by your firewall. You can stop it and check again.
after that we can think about this!

--Good luck!