We all want to avoid getting a virus on our computer, and practice safe 'surfing' on the 'net. But, if you want to add another layer of protection to your browsing, read the following article: http://www.makeuseof.com/tag/7-free-anti-virus-tools-browser-scan-links-click/
I use Safari on my iPad, but prefer the Chrome browser on my computer. One other security tip I use is, if I get an email -- even from a friend -- that only has a web link but no message, I don't click it. If, say, my friend's email has been hijacked, the hackers send out nefarious links to all the email addresses in my friend's contacts, but they don't include any message, like, hey, Jim, take a look at this article on blah blah.
I'll probably use the extension for Chrome referenced in the article, just to see how it works. I'm not paranoid about internet security, but do prefer to be cautious.