nsViewManager.cpp in Mozilla Firefox 3.0.2 through 3.0.10 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via vectors related to interaction with TinyMCE.
https://bugzilla.mozilla.org/show_bug.cgi?id=490425
https://bugzilla.redhat.com/show_bug.cgi?id=488570