Mozilla used Anthropic's Claude Mythos to fix 423 Firefox bugs in 30 days — including a 20-year-old flaw that survived decades of testing!

Mozilla's April Firefox security push delivered 423 bug fixes in a single month after the team gained access to Anthropic's Claude Mythos Preview — a volume that eclipses the roughly 420 fixes shipped across the previous 14 months combined. The compression is the story: AI-assisted discovery did in…