Firefox can be used without paying: Free to download and use; the source code is public under MPL-2.0. Check the vendor’s pricing page for current limits.

Is Firefox open source?

Yes. Firefox publishes its source code under the MPL-2.0 license.

Which platforms does Firefox support?

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

What is Firefox best for?

Privacy-minded users who want an open-source browser. In our ranking of web browsers it is number 1 of 7 with a score of 92.0.

What are the best alternatives to Firefox?

The highest-ranked alternatives on listme.name are Google Chrome, Brave, Safari, Microsoft Edge.

Firefox Review, Pricing & Alternatives (2026)

92.0score

Ranked 1 of 7 in best web browsers

Open source under MPL-2.0, with trackers blocked by default and tabs and passwords synced across devices. Its own Gecko engine sets it apart from the Chromium browsers in this list.

Best for Privacy-minded users who want an open-source browser

About Firefox

Firefox runs on Windows, macOS, Linux, Android and iOS. It syncs tabs, history and passwords between devices through a Mozilla account, and it includes tracker blocking, tab groups and reader mode. Users can turn off Firefox's built-in AI features entirely.

Firefox uses its own Gecko engine, so it differs from the Chromium browsers such as Chrome, Edge, Brave and Vivaldi. Some sites are tested mainly in Chromium, which can make a few features behave differently. Its public source code lets developers and forks such as LibreWolf build on it.

Key features

Open source, MPL-2.0 licensed
Tracker blocking by default
Tab groups and reader mode
Built-in AI features can be turned off
Syncs tabs, history and passwords

Strengths

Open source under the MPL-2.0 license
Tracker blocking on by default
Syncs tabs, history and passwords across devices

Limits

Some sites are tested mainly in Chromium browsers
Separate Gecko engine from the Chromium family

Where Firefox ranks

List	Rank	Score	Best for
Best Web browsers	1 of 7	92.0	Privacy-minded users who want an open-source browser

Alternatives to Firefox

All 6 alternatives

Compare Firefox

Questions about Firefox

Is Firefox free?: Firefox can be used without paying: Free to download and use; the source code is public under MPL-2.0. Check the vendor’s pricing page for current limits.
Is Firefox open source?: Yes. Firefox publishes its source code under the MPL-2.0 license.
Which platforms does Firefox support?: Firefox is available on: Windows, macOS, Linux, Android, iOS.
What is Firefox best for?: Privacy-minded users who want an open-source browser. In our ranking of web browsers it is number 1 of 7 with a score of 92.0.
What are the best alternatives to Firefox?: The highest-ranked alternatives on listme.name are Google Chrome, Brave, Safari, Microsoft Edge.