Firefox

About Firefox

Firefox is a web browser developed by Mozilla, available for Windows, macOS, iOS, Android, and Linux. It includes automatic tracker blocking enabled by default, tab groups, a reader mode, picture-in-picture video, a customizable sidebar, and support for over 30,000 extensions and thousands of themes. It also includes a PDF editor built into the browser.

The browser syncs bookmarks, passwords, browsing history, and tabs across desktop, mobile, and tablet devices, with data encrypted by default. It offers an import feature for bringing bookmarks, passwords, and history over from other browsers when switching to Firefox.

Firefox includes optional AI features that can be customized or disabled. Mozilla states it does not sell personal data collected from users. An Extended Support Release (ESR) build is available for users on older operating systems, including Windows 8.1 and below and macOS 10.14 and below, which are no longer supported by the standard release.

Key features

• Automatic tracker blocking and privacy protection with no setup required
• Syncs bookmarks, passwords, history, and tabs across desktop, mobile, and tablet
• Over 30,000 extensions and thousands of light/dark themes
• Edit PDFs directly in Firefox
• Tab groups, Firefox View, and customizable sidebar for workspace organization
• Optional AI features that can be customized or turned off entirely

Frequently asked questions