No, I got the problem again...
This time, I found out that there was a problem with one of the JAR files in mozilla/chrome/
All you gotta do, is change the name of one of them (I changed inspector.jar) and see if the problem's solved.
You may see a certain feauture dissapear, I don't have a Mail shortcut button now, but hey, I can live with it, and I don't have that anoying error message in my browser.
[EDIT]Oh wait, now I don't have Mail at all
[/EDIT]
[ January 13, 2003: Message edited by: Refalm ]