Malicious crackers on the internet may be targeting Mozilla based browsers now, not just IE. The claim is backed up by the fact that between July 1, 2004, and Dec. 31, 2004, the number of documented vulnerabilities affecting the Mozilla browser and Mozilla's Firefox browser was higher than the number of vulnerabilities affecting Microsoft's Internet Explorer.
"We are starting to see Firefox and Mozilla get more attention from attackers, and that is likely to continue. People who are writing Trojans and worms that get distributed via Web browser vulnerabilities are looking for the highest yield." - Alfred Huger, senior director of engineering at Symantec.
In the past, IE was the main target of attack, but this may change in future as Firefox becomes more popular.