Sources: 

Mozilla's integration of Anthropic's Claude Mythos has led to a breakthrough in browser security, enabling the identification of
271 vulnerabilities in the latest Firefox release. The Firefox team, using Mythos since February, aimed to enhance cyber defense capabilities notably.
"So far we’ve found no category or complexity of vulnerability that
humans can find that this model can’t," Mozilla stated, emphasizing the model's efficacy. The AI's evaluation reportedly helped eliminate the need for extensive human resources to detect individual bugs:
"using Mythos eliminated the need to concentrate many months of costly human effort to find a single bug", according to Holley.
Despite this advance, Mozilla affirmed that
"we also haven’t seen any bugs that couldn't have been found by an elite human researcher." The AI demonstrated significant potential, suggesting a new era where the balance of power in cybersecurity might shift. Holley remarked that prior to this development,
"computers were completely incapable of doing this a few months ago, and now they excel at it."This paves the way for every piece of software needing to incorporate AI-aided vulnerability analysis, as
"every piece of software has a lot of bugs buried underneath the surface that are now discoverable." Mozilla's proactive measures signal a turning point in the ongoing battle against cyber threats, providing defenders a newfound chance at decisive victories.
Sources: 
Mozilla has patched 271 vulnerabilities in Firefox, leveraging Anthropic's AI model, Claude Mythos. The AI tool has proven effective in vulnerability detection, claiming no bugs were found that skilled humans couldn’t have identified, and highlights a shift in the cyber defense landscape.