TYPO3 Core

Typo3 4.0.2, htmlArea RTE 1.4.2 Demo-Mode
When I have 10 Links in a list and each links to a different content element on the same side and I want to add a new link, in Firefox 2.0 I get the warning "A script doesn't answer" and the typing of the additional text is very very slow!
This problem doesn't appear in IE but I think someone of the Typo3 assoc. should have a look at this because many of our community use FF!

(issue imported from #M4465)