We hear a lot about Internet Explorer weaknesses, but little about Firefox. Mostly this is because it is VERY hard to exploit Firefox flaws before they are fixed (a powerful Open Source community ensures that). But there are a few potentially open doors for a malicious hacker to sneak through. A new Firefox Trojan Horse (i.e. a file that you have to run in order for it to do any bad stuff - it does not spread automatically) is apparently in the wild. It appears as a Firefox Extension (programs intended to expand the features of the browser) which enables some useful functions, but it also watches for credit card info and mails it back to its author.
How do you avoid this malicious program? Simple. Only install extensions from known and trusted sources (i.e. Mozilla.Org itself) or better yet (for the grandmother set) simply say "No" if Firefox ever offers to install an extension to your system.
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