Firefox users need to update their browser software following the discovery of multiple vulnerabilities.
The flaws might be exploited to bypass security restrictions, conduct cross-site scripting or spoofing attacks, pinch sensitive information, or even gain control of vulnerable systems.
The flaws affect both the 1.5 and newer 2.0 releases of the popular open source browser. Users are advised to update to versions 188.8.131.52 or 184.108.40.206 to guard against attack. Users of the SeaMonkey also need to update to version 1.0.8 because of the same set of problems.
An error in the Network Security Services (NSS) code involved in processing SSLv2 server messages might also be used to inject hostile code onto vulnerable systems running 1.5 versions of Firefox.
Mozilla isn't alone in having problems with onUnload coding, a feature security watchers have tagged as a security calamity waiting to happen for some time, the SANS Institute's Internet Storm Centre reports.
Internet Explorer 7's handling of "onunload" events might be exploited by a malicious website to spoof the address bar, security notification firm Secunia warns, in a vulnerability it describes as "less critical". ®