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Mozilla says AI helped squash 423 Firefox security bugs

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Mozilla boasts Mythos boosted Firefox bug cull

Yet it remains unclear if Anthropic's uber model was effective, or if better model middleware is what makes the difference

Mozilla fixed 423 Firefox security bugs in April, a repair rate more than five times higher than the 76 fixes issued in March and almost 20 times higher than its 21.5 monthly average last year.

The browser maker previously said Anthropic's ballyhooed Mythos Preview model found 271 of these in Firefox 150.

Now, a trio of technical types has come forward to provide a bit more detail about what Mythos (and its less storied sibling Opus 4.6) actually found. But they also highlight something that may matter more than the model: the agentic harness – the middleware mediating between AI and the end user.

Brian Grinstead, Firefox distinguished engineer, Christian Holler, Firefox tech lead, and Frederik Braun, head of the Firefox security team, ...

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