Firefox — Mozilla's free, open-source web browser with tracker blocking on by default, available on Windows, macOS, Linux, iOS, and Android.
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Firefox screenshots & video
Firefox in 20 seconds
Best for: users who want a non-Chromium, open-source browser with tracker blocking on by default
Pricing: Free with no paid tier; optional Mozilla products like Mozilla VPN are sold separately.
- Firefox is free with no paid tier and no ads within the browser itself.
- Firefox's source code is public on GitHub (mozilla-firefox/firefox) under the Mozilla Public License 2.0.
- Firefox runs on the independent Gecko engine rather than Chromium.
- Firefox holds a 4.4/5 rating from 543 reviews on Capterra.
- Firefox is available on Windows, macOS, Linux, iOS, and Android.
Limitations: Declining market share means some sites are optimized for Chromium first.; Smaller extension ecosystem than the Chrome Web Store.; Can lag Chrome's performance on some heavy, JavaScript-intensive web apps.
Top alternatives: Google Chrome, Brave, Microsoft Edge, Vivaldi, DuckDuckGo — full list
What is Firefox?
Firefox is a free, open-source web browser built on Mozilla's Gecko rendering engine, distinguishing it from the Chromium engine that powers Chrome, Edge, Brave, and most other mainstream browsers. Firefox blocks known trackers and third-party cookies by default through Enhanced Tracking Protection, without requiring users to install separate extensions, and supports over 30,000 extensions and themes for further customization. It includes built-in features like Reader Mode, picture-in-picture video, PDF editing, and cross-device sync for tabs, history, and saved passwords. Firefox's source code is published on GitHub (mozilla-firefox/firefox) under the Mozilla Public License 2.0, and Mozilla, a non-profit foundation, states it does not sell user browsing data — a contrast to Chrome's ownership by Google, whose primary revenue is advertising built on user data.
Firefox is Mozilla's web browser, built on the open-source Gecko engine and maintained by the non-profit Mozilla Foundation rather than an advertising-funded tech giant. It's free with no paid tier for the browser itself, blocks trackers and third-party cookies by default without extra configuration, and syncs tabs, history, and passwords across devices. Firefox is available on Windows, macOS, Linux, iOS, and Android, and its source code is public on GitHub under the Mozilla Public License 2.0, making it a common recommendation for users who want an alternative to Chrome or Safari that isn't controlled by Google or Apple.
Standout feature: Runs on the independent Gecko engine rather than Chromium, giving the web a genuine rendering-engine alternative to Google's dominant Blink/Chromium base, with Enhanced Tracking Protection blocking trackers by default.
Biggest weakness: Firefox's market share has declined for years as most competing browsers (Chrome, Edge, Brave, Opera) all run on Chromium, meaning some sites and web apps get tested and optimized for Chromium first and occasionally behave inconsistently in Firefox.
Pros
- Free and open source, published on GitHub under the Mozilla Public License 2.0.
- Enhanced Tracking Protection blocks third-party trackers and cookies by default.
- Runs on the independent Gecko engine rather than Chromium, preserving rendering-engine diversity on the web.
- Built-in Reader Mode, picture-in-picture, and PDF editing without extra extensions.
Cons
- Market share has declined for years, so some sites are tested against Chromium first and can render inconsistently.
- Fewer and sometimes lower-quality extensions available compared to the Chrome Web Store.
- Sync and account features are less tightly integrated with a broader productivity suite than Edge (Microsoft 365) or Chrome (Google Workspace).
- Performance and memory usage can lag Chrome on some heavy, JavaScript-intensive web apps.
Firefox pricing
Free · verified from the vendor's pricing page
| Plan | Price | Notes |
|---|---|---|
| Firefox | Free | Free, open-source browser with no paid tier; optional separate Mozilla products (like Mozilla VPN) are sold independently. |
What reviewers say
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