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Firefox

Free, open-source browser from Mozilla with tracker blocking built in

FreeBrowsersChecked Oct 5, 20264.6 on the App Store
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Firefox, as pictured on firefox.com
How Firefox presents itself. Image from firefox.com.

Our verdict

Third of our top three browsers

For: People who want an open-source browser not built on Chromium

Firefox is free with no paid tier, open source, and runs on Mozilla's own Gecko engine, not Chromium, on Windows, Mac, Linux, iPhone and Android. It blocks known trackers by default, keeps each site's cookies separate, and its AI features can be turned off entirely. On desktop, a built-in VPN covers up to 50 GB of browser traffic a month at no cost. Its iPhone and iPad app averages 4.6 from about 218,000 ratings. It is third because its listing shows tracker blocking but no ad blocker, where Brave blocks both by default, and its app has about a third as many ratings as Brave's. The built-in VPN has not reached the phone apps, and the homepage shows ads unless you turn them off.

See all three and how we rank

What is Firefox?

Firefox is a free, open-source web browser made by Mozilla Corporation, a subsidiary of the not-for-profit Mozilla Foundation. It runs on Mozilla's own Gecko engine rather than Chromium, blocks known trackers by default and isolates each site's cookies. A free Mozilla account syncs bookmarks, history, passwords and tabs across Windows, macOS, Linux, Android and iOS, and AI features are optional.

Firefox is free to use. See every plan

Good for

  • People who want tracker blocking switched on by default
  • Users who prefer an open-source browser that is not based on Chromium
  • Those who want to pick their own AI chatbot, or turn AI off
  • Anyone moving between Windows, macOS, Linux and a phone

Worth knowing

  • The built-in VPN is capped at 50 GB per month and protects browser traffic only. Mozilla's paid VPN service costs $59.88 per year or $9.99 per month, plus tax.
  • Firefox shows optional ads on its homepage to fund development. They can be turned off.
  • The built-in VPN has not reached Firefox for Android or iOS; Mozilla's roadmap lists VPN on mobile as upcoming work.
  • Windows 8.1 and below and macOS 10.14 and below are no longer supported by the standard release; they need Firefox ESR.

Key features

Tracking and cookie protection
Enhanced Tracking Protection blocks known trackers by default, and Total Cookie Protection keeps each site's cookies separate. The shield icon in the address bar shows what was blocked.
Built-in VPN
A VPN toggle in the desktop toolbar routes browser traffic through a proxy server to hide the IP address, free for up to 50 GB per month. It covers the browser only, not other apps on the device.
Tab groups, vertical tabs and sidebar
Tabs can be grouped and color coded or stacked vertically, and a customizable sidebar gives one-click access to bookmarks, history, synced tabs and other tools.
AI chatbots in the sidebar
The sidebar can host a third-party assistant such as ChatGPT, Gemini, Copilot, Claude or Mistral Chat. AI features are optional and can be turned off entirely.
Sync with a Mozilla account
Bookmarks, history, saved passwords and open tabs sync across desktop and mobile with end-to-end encryption, and Send Tab pushes a page from one device to another.
Reader mode, PDF editor and translation
Reader mode strips clutter from articles, a built-in editor fills, signs and annotates PDFs, and pages are translated in the browser without sharing the data with anyone else.

Firefox pricing

Starts at
Free
Free plan
The browser is free with no paid tier. The built-in VPN is free for up to 50 GB of browser traffic per month, and sync uses a free Mozilla account.
Free trial
None listed
Free$0The full browser on Windows, macOS, Linux, Android and iOS, including tracker blocking, sync and, on desktop, the built-in VPN up to 50 GB a month.

Read from firefox.com on Oct 5, 2026. Prices change, so confirm with Firefox before you buy.

Pricing in detail

How people rate the Firefox app

4.6

out of 5 for the iPhone and iPad app

  1. 5 stars82%
  2. 4 stars10%
  3. 3 stars3%
  4. 2 stars2%
  5. 1 star4%

217,973 ratings on the App Store in the United States, read Oct 5, 2026. It rates the app, not everything the product does. See the listing

Firefox reviews, and where to read more

Works with

Firefox alternatives

All Firefox alternatives comparedAll browsers

Common questions

Is Firefox free?

Yes. Firefox is free to use. The browser is free with no paid tier. The built-in VPN is free for up to 50 GB of browser traffic per month, and sync uses a free Mozilla account.

How much does Firefox cost?

Firefox lists one plan. Free: $0. Prices were read from firefox.com on Oct 5, 2026.

What platforms does Firefox work on?

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

How is Firefox rated?

Firefox's iPhone and iPad app averages 4.6 out of 5 from 217,973 ratings on the App Store in the United States, as read on Oct 5, 2026. That is the store's rating of the app, not a score from us.

Is Firefox open source?

Yes. Firefox is open source, according to its own site.

Is Firefox end-to-end encrypted?

Firefox describes itself as end-to-end encrypted on its own site. Nobody here has audited that.

What does Firefox integrate with?

Firefox's listing names ChatGPT, Gemini, Microsoft Copilot, Claude and Mistral. A listing names up to eight integrations, so it may connect to more.

Who makes Firefox?

Firefox is made by Mozilla Corporation.

What are the alternatives to Firefox?

The closest alternatives to Firefox in our directory are Google Chrome, Brave, Zen Browser, Vivaldi and Microsoft Edge. Each one has a side-by-side comparison with Firefox.

Sources for this page

The prices, plans, platforms and features above were read from these pages on Oct 5, 2026. What people say is linked where it appears.