Mozilla has officially rolled out Firefox 143, a new version of its browser that introduces several fresh features, usability improvements, and critical security patches. While many of the additions mirror functionality already present in rival browsers like Chrome, Edge, and Opera, they mark a significant step in keeping Firefox competitive in a fast-evolving browser market. Mozilla also confirmed that the next major release, Firefox 144, is scheduled to arrive on October 14, 2025.
One of the headline changes in Firefox 143 is the expansion of the browser’s built-in sidebar for AI chatbots. Microsoft Copilot has now joined ChatGPT, Google Gemini, Anthropic Claude, and Le Chat Mistral as available assistants within Firefox, giving users an even wider range of AI companions for productivity and research. Another major addition is Google Lens integration, enabling reverse image searches directly from the browser. However, this feature only works if Google is set as the default search engine and is being rolled out gradually. Advanced users can enable it immediately by heading to the about:config page and toggling the browser.search.visualSearch.featureGate flag to “true.”
On the Windows platform, Firefox 143 also introduces support for running websites as standalone web apps that can be pinned directly to the taskbar, accessible through a new icon located on the right-hand side of the address bar. Mozilla notes that this feature will not work with versions of Firefox installed via the Microsoft Store, though Linux and macOS users can expect similar functionality in future updates. Beyond that, smaller but meaningful refinements include drag-and-drop tab pinning, an inline camera preview when sites request camera access, and contextual display of dates and holidays directly in the address bar.
Accessibility has also been a key focus. With Firefox 143, users can now benefit from deeper integration with Microsoft’s UI Automation framework, allowing accessibility tools like Voice Access, Narrator, and Text Cursor Indicator to interact more seamlessly with the browser’s interface. Mozilla says this functionality will be introduced gradually over the coming weeks to ensure a smooth rollout.
On the security front, Firefox 143 addresses at least 11 vulnerabilities, according to Mozilla’s official Security Advisory 2025-73. Two flaws (CVE-2025-10527 and CVE-2025-10528) were categorized as high risk due to weaknesses in the Canvas2D graphics component that could allow malicious code to escape the browser’s sandbox. Another set of memory safety bugs, tracked under CVE-2025-10537, also carry a high-risk classification. The remaining issues, deemed medium to low risk, were either internally identified or reported externally. Together, the fixes underscore Mozilla’s ongoing commitment to keeping Firefox a secure choice for users in an increasingly hostile web environment.
