K-OTic/FrSIRT has released 3 exploits against Firefox 1.03; If you haven't upgraded to 1.04, this is yet another good reason to do so without delay.
Download firefox in a your preferred flavor. For a description of the problems, Mozilla has following URLs:
http://www.mozilla.org/security/announce/mfsa2005-44.html http://www.mozilla.org/security/announce/mfsa2005-43.html