Safer Web Surfing - McAfee SiteAdvisor

Mcafee have a free web browser add-on that alerts you if a
web site is associated with spam or spyware.
There is a Firefox version & a Internet Explorer (IE) version.
http://www.siteadvisor.com/download/

Security Add-On for Firefox
Our Rating: (Excellent)
McAfee SiteAdvisor is a security add-on for your Firefox browser that
helps you identify websites that are linked to spyware, adware, spam,
viruses, browser-based attacks, phishing, or online fraud.
The SiteAdvisor service is based on a huge database with detailed test
results for more than 100,000 pieces of software and covers more than 90%
of the world`s Web traffic.
The program integrates with search engine results from popular search
engines and also adds an icon to the browser toolbar that indicates
whether a site is safe to use, or should be used with caution.
If SiteAdvisor has negative information for a site, you can review a
very detailed report that shows any spam received from that site,
harmful downloads, and association with other sites.
An excellent browser add-on, that provides an in-depth site analysis
that is based on actual test results,
rather than assumptions.

You can download it from here >>
http://www.snapfiles.com/get/siteadvisorfx.html
The link above is for FireFox browser (which I recommend using)
There is also a version if you use Internet Explorer browser >>
http://www.snapfiles.com/get/siteadvisor.html