Firefox 143.0.3 is out with multiple fixes for add-ons

Mozilla has released a small update for Firefox to address several issues with the browser. Version 143.0.3 is now available for download with a few fixes for bugs that affect extensions and their updates, problems with keyboard shortcuts resetting when opening extension settings, long load times on certain connections, security issues, and more.

Here is the changelog:

• Adjusted the timing of the new drag-to-pin interaction cue for better reliability. (Bug 1989344)
• Fixed an issue that prevented some extensions from updating via the Add-ons Manager. (Bug 1984724)
• Fixed a regression that prevented Firefox View sections from collapsing/expanding as expected. (Bug 1989200)
• Addressed a WebExtensions storage issue that could cause Firefox to crash on startup with certain extensions installed. (Bug 1989840)
• Fixed an issue where opening an add-on's "Extension settings" from the post-install prompt could break the Customize tab and some keyboard shortcuts until restart. (Bug 1983869)
• Reduced long delays when loading certain websites while connected to networks that block UDP connections. (Bug 1980812)
• Various stability fixes.

As for security fixes, Mozilla patched two high-severity vulnerabilities. One is CVE-2025-11152, "Sandbox escape due to integer overflow in the Graphics: Canvas2D component," and another is CVE-2025-11153, "JIT miscompilation in the JavaScript Engine: JIT component."

You can download Firefox 143.0.3 by heading to Menu > Help > About Firefox. Alternatively, get the browser from the Microsoft Store (Windows 10 and 11), its official website, or Neowin's software page. For reference, here is the link to Firefox 143.0, which was released at the beginning of September. It introduced several interesting changes, such as the ability to run websites as apps, improvements to tab pinning, camera preview for webcams, and more. Shortly after release, Mozilla pushed Firefox 143.0.1, a small bug-fixing update.

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Posted Wednesday 1 October 2025 at 6:47 am AEST (my time).

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