At Pwn2Own 2014, an annual computer hackfest in Vancouver, Mozilla's Firefox has proven yet again that it's the least secure major web browser. While all four major web browsers -- Chrome, Internet Explorer, Firefox, and Safari -- were successfully exploited, for a grand total of $850,000 in prize money awarded to successful security researchers, Firefox was by far the least secure browser, racking up no less than four zero-day vulnerabilities. These vulnerabilities, if they were in the wild, would allow a hacker to do just about anything with your computer if you visited a specially crafted website.