Dr.Web anti-virus link checker is a useful Firefox add-on (Also for Internet Explorer and Opera available) that scans for viruses and different kinds of malicious programs, such as dialers, spywares or adwares any website link before you entering the site or any file you are about to download with the most up-to-date version of the Dr.Web online scanner.The plug-in for Firefox also scans links in e-mail messages processed by Mozilla Thunderbird. Using this add-on is quite easy, after installing just right clicks on any link and select ‘Scan with Dr.web’. You can see the results with in a few seconds.
Download for Firefox browser
For other browsers click here