[Typo3] tt_news/RSS not working with all Browsers that can display RSS

[Kanu- und Ski-Club Lünen e.V. - Thorsten Dorn]

Hello everybody,

I set up a RSS newsfeed with tt_news 2.1.1 and discovered that Safari  
2 on my Apple Mac is displaying it like it displays any other  
newsfeed on the Web. Then I loaded the page with Firefox 1.0.4 on my  
Windows PC, but only the XML source code is diplayed. What's going  
wrong?
Would be glad if you could have a look on feed://www.ksc-luenen.de/ 
index.php?id=100&type=100 or rather http://www.ksc-luenen.de/ 
index.php?id=100&type=100 and give me some hints

Thanks,
Thorsten