This message was reported to full-disclosure http://lists.netsys.com/pipermail/full-disclosure/2004-November/029434.html It is possible to crash mozilla with a few lines of HTML. This issue also affects galeon for RHEL2.1 as well as mozilla for RHEL2.1
This issue is being watched upstream by these bugs https://bugzilla.mozilla.org/show_bug.cgi?id=271716 https://bugzilla.mozilla.org/show_bug.cgi?id=271718
The Mozilla Software Foundation do not in general treat simple unexploitable crashes of a browser as a security issues. Removing security severity.
Fixed by bumping to seamonkey.