Anthropic, in collaboration with Mozilla, identified 22 security flaws in the Firefox browser during a two-week test, with 14 of the vulnerabilities classified as serious.
The discoveries were made using the AI model Claude Opus 4.6. It began by analyzing the Firefox JavaScript engine and then moved on to other parts of the code base. In total, the model examined nearly 6,000 C files and generated 112 error reports.
Most of the vulnerabilities had already been fixed in Firefox 148, which was released in February. However, some of the fixes are not expected until the next version of the browser is released.
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