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What just happened? Mozilla's latest browser release doubles as a live-fire test of how far AI-assisted security has come, and how quickly it's reshaping software development. With Firefox 150 , Mozilla says it has fixed 271 vulnerabilities identified not by fuzzers or human red-teamers, but by Anthropic's Mythos Preview model analyzing unreleased Firefox source code.

The result, in the view of Firefox CTO Bobby Holley, marks a decisive shift in the long-running asymmetry between attackers and defenders. "Defenders finally have a chance to win, decisively," he wrote in a blog post.

Holley says Mythos Preview demonstrated the kind of global, semantic reasoning over a large, complex codebase that, until recently, only elite human analysts could perform.…