VTZilla - Addon Integrating Multi-Engine Antivirus Scanner VirusTotal With Firefox

Multi-engine anti-virus scanners are a great help when dealing with suspicious files as you are able to leverage the malware detection capabilities of multiple antivirus engines with most up-to-date definitions from a single interface. VirusTotal has been one of the most well-known such free service offering scanning of suspicious files and URLs with 42 anti-virus engines helping users reveal viruses, worms, trojans and other kinds of malicious content.
One of the most needed feature to make efficient use of multi-av scanning services is an browser helper utility which would enable users to scan URL's and files right from their web-browsers before visiting the suspicious link, thankfully VirusTotal team has realized this and a Firefox web-browser addon VTZilla is now available enabling users to right-click any suspicious link and launch a VirusTotal URL Scan and even pre-scan a file before downloading from the default "Firefox Download Save" dialog-box.

Using VTZilla to scan a link will only present you with the URL scan report and you must click "View downloaded file analysis" link to make VirusTotal actually download and scan the file via their multi-engine antivirus scanner.