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Firefox

Mozilla's independent, open-source browser, built on its own Gecko engine with strong privacy defaults.

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Verified facts
5 of 5
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6
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About Firefox

Firefox is the main browser not built on Chromium or WebKit. It is made by Mozilla, a non-profit-owned organisation, and runs on its own Gecko engine, which keeps an independent voice in web standards. Out of the box it blocks many cross-site trackers, isolates cookies per site, and supports DNS over HTTPS. It also keeps full support for powerful content blockers such as uBlock Origin, which Chromium browsers have restricted. Other features include a PDF editor, container tabs via an add-on, a picture-in-picture video player, vertical tabs, and Firefox Sync with end-to-end encrypted data. Its extension catalogue is smaller than Chrome's but still large. Some sites are tested less in Firefox, so occasional breakage happens. It is free and open source under the Mozilla Public License, and runs on Windows, macOS, Linux, Android and iOS (where Apple requires WebKit underneath). It suits people who want a mainstream browser that is not run by an advertising giant.

Best for: People who want a mainstream, independent browser with strong privacy and ad-blocker support.

Pros and cons

What works

  • Independent Gecko engine
  • Full support for advanced ad blockers
  • Strong tracking protection by default

Why people leave

  • Some sites are tested less and occasionally break
  • Smaller extension catalogue than Chrome
  • No longer supports Windows 8.1 and older

Top Firefox alternatives

See all 6
  1. 1LibreWolf logo
    LibreWolf

    Firefox with telemetry stripped and uBlock Origin built in.

    66.5
  2. 2Zen Browser logo
    Zen Browser

    Firefox-based with a modern sidebar layout, workspaces and split view.

    62.6
  3. 3Brave logo
    Brave

    Chromium compatibility with ad and tracker blocking on by default.

    59.6
  4. 4Mullvad Browser logo
    Mullvad Browser

    Tor Project's anti-fingerprinting browser without the Tor network.

    57.2
  5. 5Waterfox logo
    Waterfox

    Firefox-based with privacy defaults and built-in ad blocking.

    55.3

Why people left Firefox

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

No switching stories yet. If you moved away from Firefox, review the app you switched to and tell us why.

Reviews

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Firefox: common questions

Is Firefox free?

Yes. Firefox is free, open-source software.

Is Firefox open source?

Yes.

What platforms does Firefox run on?

Firefox is available for Windows, macOS, Linux, iOS and Android.

What are the best alternatives to Firefox?

The highest-ranked Firefox alternatives right now are LibreWolf, Zen Browser and Brave. See the full ranked list for pricing, platforms and verified facts.

See all 6 Firefox alternatives