Firefox Security Update

Firefox, Mozilla and Claude Mythos

Mozilla Fixes 271 Firefox Bugs Using Anthropic’s Mythos AI

Mozilla says Firefox 150 patches 271 vulnerabilities found with Anthropic’s restricted Mythos AI, highlighting how quickly AI-driven bug hunting is accelerating.

The Next Web · 2d

Mozilla patched 271 Firefox bugs found by Anthropic’s Mythos, and says the zero-day era has an expiration date

· 2d

New Firefox update patches a whopping 271 bugs with help from Claude Mythos

The Financial Express · 9h

Telcos step up vendor checks as Anthropic’s ‘Mythos’ flags new cyber risks

The emergence of advanced AI systems such as Claude Mythos from Anthropic is prompting telecom operators to reassess cybersecurity preparedness, as these tools uncover software vulnerabilities that tr...

· 18h

Mythos shock: Why regulators in India, other nations are spooked by Anthropic’s new tool

· 1d

Anthropic’s Mythos breach was humiliating

11h

This Firefox vulnerability may have been tracking all your private Tor identities – even in Private Mode

Researchers uncovered a flaw in Firefox and Tor Browser that allowed websites to generate hidden, stable identifiers without cookies. The issue stemmed from IndexedDB behavior, enabling persistent fingerprinting even in private browsing or Tor’s “New Identity” mode.

Mythos found 271 Firefox flaws – but none a human couldn’t spot

The FOSS outfit on Tuesday reminded readers that it used Anthropic’s Opus 4.6 model to look for bugs in Firefox 148 and found 22 bugs. Mythos found 271 vulnerabilities in Firefox 150. Mozilla CTO Bobby Holley expressed mixed feelings about that result,

TweakTown

Anthropic's Claude Mythos found 271 Firefox vulnerabilities - CTO calls it just as capable as 'elite security researchers'

Firefox CTO Bobby Holley believes that with Mythos, cybersecurity defenders finally have a real chance to win, saving months of costly human effort.

Hosted on MSN

Firefox 150 and iOS 26.4.2 roll out with security fixes

Apple has released iOS 26.4.2 with unspecified bug fixes and a single security patch, while Mozilla’s Firefox 150 adds PDF editing tools, improved split view, and addresses 41 security vulnerabilities. Both updates underscore a broader push for timely ...

1don MSN

Mozilla declares ‘zero-days are numbered’ as Anthropic’s Mythos AI matches elite bug hunters

Mozilla uses Anthropic’s Mythos to match human expertise in finding bugs

2don MSN

Firefox 150 turns its PDF viewer into a real PDF editor

With Firefox’s latest version 150 update for Windows, macOS, and Linux, Mozilla has introduced few genuinely new features but some noteworthy improvements. The split view is easier to use, the built-in PDF viewer is increasingly evolving into a PDF editor,

Firefox 150 Arrives With Over 270 More Fixes, Plus New Features

Mozilla’s partnership with Anthropic is really paying off. In March, it announced that Anthropic’s Frontier Red Team had helped it find and fix 22 security-sensitive bugs and 90 other bugs in Firefox. But this month’s bounty is even bigger: Firefox 150 is out today with fixes for 271 vulnerabilities.