Mozilla and Google have released browser updates that together repair more than 200 security vulnerabilities, and both companies are urging users to install them. Mozilla's Firefox 159, available for Windows, Android, MacOS and Linux, addresses 167 security bugs, 108 of them rated high severity and the remainder moderate or low. Google's Chrome update covers 52 security bugs across its Windows, Mac and Linux builds.
Nearly 100 of the Firefox flaws are use-after-free vulnerabilities, a class of memory management defect that an attacker could use to crash the browser or run malicious code. Several of the Firefox bugs also involve the browser's Sandbox, meaning a successful exploit could let a hacker escape that protected area to execute code. Firefox users can update by opening the three-line menu at the upper right, going to Help and Report, choosing About Firefox, and restarting the browser once the update installs.
Chrome's release carries version numbers 56.0.8078.73 and .74 for Windows and Mac and 156.0.8078.73 for Linux. Four of its 52 patched bugs are rated critical and 46 high. The four critical flaws involve memory corruption and, as with some of the Firefox issues, touch the Sandbox, allowing an attacker to bypass that protection and run malicious code. Chrome users update through the three-dot menu at the top, then Help and About Google Chrome, and restart when prompted.
Firefox 159 also adds features beyond the security work. On the Mac, sharing a page now brings up the built-in MacOS share picker, showing a preview of the page alongside recent contacts and apps such as AirDrop and Messages. Saved passwords are now reachable from the sidebar by clicking the Sidebar button on the address bar and then the key icon. Mozilla's AI-powered Smart Window can also monitor specific web pages and notify users when they change, set up by opening Smart Window, visiting the page, typing /watch in the chat window, completing the form and clicking Create Task.
Both advisories credit AI systems with helping surface the bugs. Mozilla cited Amy Burnett, a security research and analyst at OpenAI, for uncovering many of the Firefox flaws. Google's blog post attributed several Chrome discoveries to Anthropic's Claude and a few to OpenAI.
Ziff Davis, the parent company of the outlet that published the original report, filed a lawsuit against OpenAI in April 2025 alleging copyright infringement in the training and operation of its AI systems.
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