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Whilst it isn’t specifically designed as a security device, but an ad blocker. Now a days there are many malvertising ads, these are adverts crafted to deliver malware or in some cases actual advertising companies get hacked.

So it is wise to have a general ad blocker.

There are other add-ons that can also help, RequestPolicy is a firefox add-on that blocks access to third party sites, unless you specifically allow them. This can do the same thing as many adverts are from a third party site not the page you are actually visiting. Not only that it can also prevent driveby downloads (usually malware) where a site has been hacked.

So there are tools that may not have been specifically designed to block malware, but can seriously add (excuse the pun) to your security.