Unpatched Memory Corruption Flaw In Latest Firefox 3.5 Can Install Malware
 

excerpt
[Secunia advises Firefox users to avoid browsing untrusted websites or following untrusted links pending the availability of a fix from Mozilla (there’s nothing in the pipeline just yet).

The appearance of an unpatched vulnerability in Firefox could hardly have come at a worse time because it coincides with confirmation from Microsoft on Monday of a second unpatched ActiveX flaw affecting users of its Internet Explorer software.]
http://cyberinsecure.com/unpatched-m...stall-malware/

possible helpers -

[12 Useful FireFox Plugins For Safe Browsing

Being secure, on the web specially is something we all need. There are thousands of risks roaming and getting evolved in shape of different malwares, viruses, file & more. Since these things come via your browser and majority of us use firefox, here are some of the best and useful plugins/add-ons...]
http://www.smashingdownloads.com/200...safe-browsing/