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30 October 2026·6 min read·By Julian Sterling

Firefox Chrome Security Flaws Patched in Major Updates

Mozilla and Google have released new versions of Firefox 159 and Chrome 56, patching over 200 Firefox Chrome security flaws. Users urged to update immediately.

Firefox Chrome Security Flaws Patched in Major Updates

Major security flaws affect Firefox and Chrome. Both browser developers have issued major updates. They're addressing a combined total of over 200 vulnerabilities. Update your browser immediately. So, users on Windows, Android, MacOS, and Linux are strongly advised to do this, protecting against active exploits and securing their online activity.

Critical Vulnerabilities Patched in Firefox

Mozilla has rolled out Firefox version 159, a significant update that includes fixes for 167 security bugs across all supported platforms. A substantial portion of these, 108 vulnerabilities, are classified as high severity, indicating a serious risk if left unpatched. The remaining flaws range from moderate to low severity.

Among the high-severity patches are nearly 100 use-after-free (UAF) vulnerabilities. These memory management issues could allow an attacker to crash the browser or, more dangerously, execute malicious code on a user's system. Several identified bugs also impact Firefox's Sandbox, a key protective layer designed to isolate browser processes from the rest of the operating system. Exploiting these Sandbox flaws could enable hackers to bypass this protection and run malicious code, highlighting the severe implications for user security.

How to Update Firefox Promptly

Given the nature of these security bugs, updating Firefox should be a top priority. The process is straightforward:

  • Open the Firefox browser.
  • Click the three-line menu icon located in the upper right corner.
  • Navigate to 'Help and Report'.
  • Select 'About Firefox'.
  • The latest update will begin installing automatically.
  • Restart Firefox to complete the installation process and apply the patches.

Beyond the security enhancements, Firefox 159 introduces several new features designed to improve user experience. For Mac users, sharing a page directly from the browser now utilizes the built-in MacOS share picker, offering a preview of the page alongside recent contacts and direct integration with apps like AirDrop and Messages. Users can also now access Firefox’s saved passwords tool conveniently from the sidebar. To enable this, ensure the sidebar is visible by clicking its button on the Address bar, then select the key icon to display saved credentials. Perhaps the most intriguing new addition is Firefox’s AI-powered Smart Window, which can monitor specific web pages for changes and send notifications when updates occur. This feature is activated by clicking the Firefox icon in the upper right, selecting 'Smart Window', navigating to the desired website, typing '/watch' in the chat window, filling out the form, and clicking 'Create Task'.

Chrome Addresses Critical Vulnerabilities

Google has also released a vital update for its Chrome browser, bringing it to version 56.0.8078.73/.74 for Windows and Mac, and version 156.0.8078.73 for Linux. This update resolves 52 security bugs, including four rated as critical and 46 as high severity. These critical flaws primarily stem from memory corruption problems.

a computer screen with a bunch of code on it

Chrome's Sandbox is a target. Like issues in Firefox, several Chrome vulnerabilities specifically aim there. By exploiting these flaws, attackers can bypass the browser's protected Sandbox area and execute malicious code. This makes immediate updates imperative for user safety. But other fixed bugs involve use-after-free (UAF) issues; it's a serious problem. Attackers exploit these memory management flaws, often leading to browser crashes or the installation of malicious software.

Updating Your Chrome Browser

Ensuring your Chrome browser is up-to-date is a simple yet crucial step for online security:

  • Click the three-dot menu icon at the top right of the Chrome browser window.
  • Hover over 'Help'.
  • Select 'About Google Chrome'.
  • If prompted, allow the latest update to download.
  • Restart the browser to finalize the update installation.

AI's Growing Role in Uncovering Browser Weaknesses

Security flaws hit Firefox, Chrome. These latest vulnerabilities highlight a shared, growing reliance on artificial intelligence in the ongoing battle against cyber threats, as both browser developers acknowledge AI's notable contributions in identifying such weaknesses. It's working. Mozilla specifically cited Amy Burnett, a security research and analyst at OpenAI, for her role in uncovering many of the bugs addressed in the recent Firefox update. And Google attributed several Chrome flaws to Anthropic’s Claude, with additional contributions from OpenAI.

Mozilla cited Amy Burnett, a security research and analyst at OpenAI, for uncovering many of the bugs.

This trend suggests that AI-powered tools are becoming an increasingly vital asset for security researchers, helping to pinpoint complex and subtle vulnerabilities that might otherwise go unnoticed, thus strengthening the overall security posture of widely used software.

Market Context: According to Bloomberg, the number of software security vulnerabilities discovered in 2026 is on pace to roughly double the total reported in 2025, largely because AI has made it much faster to identify software flaws.

Frequently Asked Questions

What types of security flaws were addressed in the recent Firefox and Chrome updates?

The recent Firefox version 159 update addressed 167 security bugs, including 108 high-severity vulnerabilities like nearly 100 use-after-free (UAF) issues and flaws impacting its Sandbox. Chrome's update, version 56.0.8078.73/.74, resolved 52 security bugs, including four critical and 46 high-severity flaws, primarily stemming from memory corruption problems, Sandbox vulnerabilities, and use-after-free issues. Both updates aimed to prevent attackers from executing malicious code or crashing the browser.

Why is it important for users to update their browsers immediately after these patches are released?

It is strongly advised for users on Windows, Android, MacOS, and Linux to update their browsers immediately to protect against active exploits and secure their online activity. The identified vulnerabilities, particularly the high-severity and critical flaws, could allow attackers to bypass protective layers like the Sandbox or execute malicious code on a user's system. Prompt updating ensures these serious risks are mitigated, enhancing user safety.

How can a user update their Firefox browser to apply these security patches?

To update Firefox, open the browser and click the three-line menu icon located in the upper right corner. Then, navigate to 'Help and Report' and select 'About Firefox.' The latest update will begin installing automatically, and users must restart Firefox to complete the installation process and apply the patches.

Who contributed to identifying many of the security bugs patched in the Firefox and Chrome updates?

Artificial intelligence played a significant role in uncovering many of these browser weaknesses, with both developers acknowledging AI's contributions. Mozilla specifically cited Amy Burnett, a security research and analyst at OpenAI, for her role in uncovering many Firefox bugs. Google attributed several Chrome flaws to Anthropic's Claude, with additional contributions from OpenAI.

What new user experience features were introduced in Firefox version 159 in addition to the security fixes?

Beyond security enhancements, Firefox 159 introduced several new features designed to improve user experience. For Mac users, sharing a page directly from the browser now utilizes the built-in MacOS share picker, and users can access Firefox's saved passwords tool conveniently from the sidebar. Perhaps the most intriguing new addition is Firefox's AI-powered Smart Window, which can monitor specific web pages for changes and send notifications when updates occur.

Julian Sterling
Written by
Enterprise IT Correspondent

Julian Sterling reports on enterprise IT, data infrastructure and the vendors that keep modern business running. He has a long-standing interest in how organisations modernise their systems without breaking what already works.

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