LXer: Firefox Security add-ons
 

Published at LXer:

When it comes to security, Firefox is the best browser. Not only because of the way that browser is built and how fast all bugs were fixed in it, but also because of its addons. Security add-ons are very effective to detect viruses before download, stop any sort of malicious scripts that could be injected to your computer. It also advice you which site you should avoid in order to be away from any bad cookies that could come from it. You better get you're add-ons installed because without them, your Firefox is vulnerable.

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The virus one and Macaffe are both for windows what would be the point if they even worked in Linux.

No Script is a definite must though.