Firefox has reached version 143, delivering a mix of new features, UI refinements, and security fixes that bring it closer to parity with other leading browsers. Mozilla highlighted several improvements at launch, while also confirming that Firefox 144 will follow on October 14, 2025. This update expands Firefox’s AI integrations, introduces Google Lens for reverse image searches, and continues Mozilla’s emphasis on privacy and accessibility.
The most prominent feature in Firefox 143 is the addition of Microsoft Copilot to the AI chatbot sidebar. It joins a roster that already includes ChatGPT, Google Gemini, Anthropic Claude, and Le Chat Mistral, giving users multiple options for AI-powered assistance without leaving the browser. Firefox is also catching up to rivals with the integration of Google Lens, which allows users to search for information about images directly from the browser interface. Lens is rolling out gradually and requires Google to be set as the default search provider, though advanced users can manually activate the feature via about:config by enabling the browser.search.visualSearch.featureGate setting.
For Windows users, Mozilla has added support for installing websites as standalone progressive web apps that can be pinned to the taskbar. A new shortcut icon in the address bar handles the process, though the feature is unavailable in Microsoft Store builds of Firefox. Linux and macOS versions are slated to gain similar functionality in later releases. Additional enhancements include the ability to pin tabs by dragging them into a dedicated area, real-time camera previews when a site requests webcam access, and inline display of key dates and events such as holidays directly in the address bar.
Accessibility improvements are another highlight. Firefox 143 introduces experimental support for Microsoft’s UI Automation interface, enabling tools like Narrator, Windows Voice Access, and Text Cursor Indicator to work more effectively with the browser. Mozilla says the feature will be deployed in stages, ensuring stable performance across different configurations.
As expected, the release also addresses security vulnerabilities. Mozilla’s Security Advisory 2025-73 lists 11 patched issues, two of which (CVE-2025-10527 and CVE-2025-10528) are classified as high risk. These involved flaws in the Canvas2D rendering system that attackers could potentially exploit to escape the browser sandbox. A group of memory safety bugs tracked under CVE-2025-10537 also received a high-risk label, though their full scope remains unspecified. The remaining vulnerabilities were considered medium to low severity. These updates reinforce Mozilla’s ongoing strategy of pairing new features with rigorous security maintenance, ensuring Firefox remains both modern and resilient in an increasingly competitive browser landscape.