Tag: mozilla

Mozilla uses Mythos to fix 271 bugs in latest Firefox, claims «vertigo»

The Mythos model is only available to select organizations for defensive cybersecurity. (Picture: generated)
The browser developer has been working with Anthropic since February, and got their hands on an early version of Claude Mythos Preview to scan for vulnerabilities.

— For a hardened target, just one such bug would have been red-alert in 2025, and so many at once makes you stop to wonder whether it’s even possible to keep up, Mozilla writes in their blog.

The upshot is that the 271 bugs mean that the company can approach security «much better than just keeping up», and that «defenders finally have a chance to win, decisively.»

— We have many years of experience picking apart the work of the world’s best security researchers, and Mythos Preview is every bit as capable, Mozilla continues.

They used Claude Opus 4.6 to find 22 bugs back in March, but this Mythos-powered bug hunt was so large it left them with a feeling akin to vertigo, they say.

Read more: Mozilla’s blog, interview on Wired, writeups on Ars Technica and Engadget.

Claude finds 22 security vulnerabilities in the latest version of Firefox

Claude spent two weeks finding a fifth of all serious bugs in all of 2025. (Picture: Adobe)
14 of the bugs Opus 4.6 discovered were classified as «high-severity vulnerabilities» and were fixed by Mozilla in the latest update in late February.

The process took only two weeks to find about a fifth of the total high-severity risks found in all of 2025 — providing a much faster way to scan for bugs.

— Opus 4.6 is currently far better at identifying and fixing vulnerabilities than at exploiting them. This gives defenders the advantage, Anthropic writes, but warns this might change.

Claude works on the full stack, from initial bug hunting to verification and then suggesting patches, offering much needed relief to overworked developers.

— We view this as clear evidence that large-scale, AI-assisted analysis is a powerful new addition in security engineers’ toolbox, Mozilla says in a blog post.

Read more: Anthropic’s workthrough, Mozilla’s blog. Writeups on TechCrunch and Axios.

Keep AI queries private, Mozilla petitions Meta

It's too easy to share Meta AI queries, and most dont understand they are doing it.
Meta AI users don’t understand what they are sharing, leading to embarrassment — or worse. (Picture: Wesley Fryer, CC BY 2.0)
Mozilla has launched a public petition calling on Meta to shut down its new «Discovery» feed in the Meta AI app, arguing that the tool is «invasive» and violates user expectations of privacy.

The new feature — part of Meta AI’s expansion across Facebook, Instagram, WhatsApp, and Messenger — surfaces old queries in the Discovery feed in Meta AI’s new Llama 4 app.

People don’t know what they are sharing
There is a button in the app where you have to give explicit permission for Meta to share your query , but it seems to be getting lost in the rollout across the Meta universe.

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