When I try to connect via Mozilla to an ET server, it follows the wrong line: Mozilla instead of ET.exe.
I can't find the error, somebody has any idea's?
GT also says: Force join servers: false.

Hi chezz_nl,

"Force join servers" doesn't apply to ET. This is an option selects a game if you have multiple distributions of the game installed (example, retail and steam). Since we only support one distribution of ET, this option doesn't apply.

Based on your post, I'm unclear of the error that you're describing. Posting a screenshot may help.

To further assist you, I would need information from the following thread: http://www.gametracker.com/forums/forum.php?site=1&thread=42459

Also, our FAQ has some information on launching games from GT. See the "HOW DO I RESOLVE "Unable to launch requested game as it is not a known game."" section of this page: http://www.gametracker.com/downloads/faq.php