Claude Mythos Finds 271 Firefox Vulnerabilities
All the flaws could have also been found by an elite human researcher, according to Mozilla.
The post Claude Mythos Finds 271 Firefox Vulnerabilities appeared first on SecurityWeek.
Firefox
Mozilla Releases Firefox 149.0 With Free Built‑In VPN Offering 50 GB Monthly Data
Mozilla released Firefox 149.0 to the Release channel, bringing a significant set of privacy and security enhancements to the browser. The standout feature of this update is the integration of a free, built-in VPN designed to protect users on public ne…
Mozilla Releases Firefox 149.0 With Free Built‑In VPN Offering 50 GB Monthly Data
Mozilla released Firefox 149.0 to the Release channel, bringing a significant set of privacy and security enhancements to the browser. The standout feature of this update is the integration of a free, built-in VPN designed to protect users on public ne…
Firefox 148 Unveils New Sanitizer API to Mitigate XSS Attacks in Web Applications
Firefox has launched a major update to help protect web applications from Cross-Site Scripting (XSS) attacks. With the release of Firefox 148, Mozilla introduces the new standardized Sanitizer API, making it the first browser to ship this built-in secu…
Firefox Will Give Users an AI Kill Switch for Better Privacy
Not everyone wants AI in their browser. Firefox 148 is introducing easy toggles to disable chatbots and AI tab grouping. Discover how Mozilla is prioritising user choice and privacy in its latest 2026 update.
Mozilla Introduces Global Kill Switch for Firefox AI Capabilities
Mozilla has rolled out comprehensive AI controls in Firefox 148, launching February 24, 2026, allowing users to globally disable all generative AI features across the browser. The update addresses growing user concerns about AI integration while mainta…
GhostPoster Browser Malware Hid for 5 Years With 840,000 Installs
Researchers uncover a 5-year malware campaign using browser extensions on Chrome, Firefox and Edge, relying on hidden payloads and shared infrastructure.
Chrome 144, Firefox 147 Patch High-Severity Vulnerabilities
The two browser updates resolve 26 security defects, including bugs that could be exploited for code execution.
The post Chrome 144, Firefox 147 Patch High-Severity Vulnerabilities appeared first on SecurityWeek.
GhostPoster Firefox Extensions Hide Malware in Icons
The malware hijacks purchase commissions, tracks users, removes security headers, injects hidden iframes, and bypasses CAPTCHA.
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Update Firefox to Patch CVE-2025-13016 Vulnerability Affecting 180 Million Users
AI security firm AISLE revealed CVE-2025-13016, a critical Firefox Wasm bug that risked 180M users for six months. Learn how the memory flaw allowed code execution.