Firewalls are superb at deflecting obvious network attacks. And intrusion detection systems continue to make remarkable advances. So why are network breaches continuing at an unprecedented scale? One reason is the bad guys are adept at leveraging a work tool we all use intensively every day: the Web browser. Microsoft Explorer, Mozilla Firefox, Google Chrome and Apple Safari by design execute myriad tiny programs over which network administrators have zero control. Most of this code execution occurs with no action required by the user. That’s what makes browsers so nifty. So if browsers represent a wide open sieve to company networks, could inoculating browsers be something of a security silver bullet? A cadre of security start-ups laser-focused on boosting browser security is testing that notion. The trick, of course, is to do it without undermining usability. ThirdCertainty recently sat down with one of these security innovators, Branden Spikes, to discuss the progress and promise of improving Web browser security. Spikes left his job as CIO of SpaceX, where he was tasked with securing the browsers of company owner Elon Musk’s team of rocket scientists, to launch an eponymous start-up, Spikes Security.