Windows Browsers Firefox V143 (2025)

Firefox 143 for Windows: Web Apps, AI, and Enhanced Privacy

The open-source landscape is shifting, and Firefox 143 (released late 2025) brings some of the most requested features to the Windows desktop. At Chasms.com, we’ve updated our technical library to include the latest visual walkthroughs of these "taskbar-ready" features, ensuring your 2026 browsing experience is as efficient as possible.

Web Apps Finally Land on Windows

The standout feature of Firefox 143 is the ability to run websites as Web Apps (also known as "taskbar tabs"). You can now pin any website directly to your Windows taskbar or Start menu. Once launched, the site opens in a simplified window without the traditional browser UI, allowing it to function like a standalone desktop application while still retaining access to your installed add-ons.

Sidebar Intelligence with Copilot

In a major productivity move, Firefox has integrated Microsoft Copilot directly into the sidebar. You can now use AI to summarize complex technical pages, draft emails, or generate code snippets without ever switching tabs. Copilot joins ChatGPT and Claude in the Firefox sidebar, giving you the flexibility to choose the AI assistant that best fits your workflow.

Privacy-First File Management

Firefox 143 introduces a smarter way to handle downloads in Private Browsing mode. When you download a file during a private session, the browser will now prompt you to choose whether to keep or automatically delete the file once the session ends. This adds a critical layer of hygiene for users handling sensitive data on shared or professional workstations.