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Mozilla Firefox

Mozilla's independent open-source browser with tracking protection built in

Open source (MPL-2.0) WindowsmacOSLinuxAndroidiOS

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1 · LIGHT

Sponsored shortcuts and stories on the new-tab page, and telemetry on by default; all can be switched off in Settings.

What the numbers mean

About

Firefox is the open-source browser made by Mozilla, whose parent is the non-profit Mozilla Foundation. Unlike most mainstream browsers it runs on its own Gecko engine rather than Chromium, which keeps an independent rendering engine alive on the web. Enhanced Tracking Protection blocks many cross-site and social-media trackers, cryptominers and fingerprinting scripts by default, and Total Cookie Protection keeps each site's cookies in a separate jar. A Mozilla account syncs bookmarks, passwords, history and open tabs with end-to-end encryption. The add-on catalogue includes advanced content blockers, and recent releases added vertical tabs and tab groups. Firefox suits privacy-minded users, web developers who test across engines, and anyone who wants a major browser that is not run by an advertising company. Versions are also available for Android and iOS.

  • Independent Gecko engine, not based on Chromium
  • Enhanced Tracking Protection on by default
  • End-to-end encrypted sync with a Mozilla account
  • Large add-on library, including advanced content blockers
  • Vertical tabs, tab groups and picture-in-picture video

Before you download

  • Current releases need Windows 10 or macOS 10.15 or later; older systems are offered the Firefox ESR 115 branch instead.

What it looks like

Screenshot of Mozilla Firefox
Screenshot from Wikimedia Commons, free licence — the file page names the author and the licence.

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