the problem with traditional browsers is that the way people use the Web Instead of just looking up information on static pages coded with HTML, or HyperText Markup Language, people are using the browser to run Web versions of applications that used to reside on a PC, such as e-mail, social networking, and online banking. But browsers weren’t built to manage access to applications and sensitive data. And their vulnerability to digital attacks is increasingly attracting everyone from run-of-the-mill mischief makers to sophisticated criminal organizations. Researchers at Sophos, a security company based in Abingdon, England, near Oxford, say they are discovering sabotaged sites every 3.6 seconds, quadruple last year’s rate.