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Mozilla Firefox

firefox.com

Free plan Open source WebWindowsmacOSLinuxiOSAndroid
Visit firefox.com
Spec score 9.0 #11 of 154 in Web browsers

What it is

Mozilla Firefox is a free, open-source web browser that uses the Gecko engine. It is available on Windows, macOS, Linux, iOS, Android, and as a browser extension, and its download page lists availability in more than 90 languages. Standard tracking protection and built-in ad blocking are included. Total Cookie Protection isolates cookies so they cannot follow users between websites, while Tab Groups organize open tabs by project, mood, or task. A Mozilla account can sync bookmarks, passwords, and open tabs across devices. Firefox also offers access to multiple AI chatbots in one place, letting users choose whether to use them. Thousands of free extensions are available through addons.mozilla.org. Mozilla’s privacy notice says browsing history, form data, temporary files, and cookies are processed on the device unless stated otherwise. Automated translation and PDF alt-text suggestions use downloaded language models locally; Firefox says those features do not send page content, PDFs, images, or tab URLs to Mozilla. Firefox is listed at free.

Spec sheet

Product
Firefox is a web browser that Mozilla describes as fast, private and useful across devices.Read 29 Sep 2026 · firefox.com
Supported platforms
bothRead 21 Sep 2026 · mozilla.org
Free plan
YesRead 21 Sep 2026 · mozilla.org
Security
Firefox uses Google Safe Browsing to protect against malicious downloads and phishing attacks, and validates web pages and technical data with certificate authorities.Read 29 Sep 2026 · mozilla.org
Privacy
Firefox's privacy notice says browsing history, form data, temporary files and cookies are processed on the device unless the notice says otherwise.Read 29 Sep 2026 · mozilla.org
Support
Mozilla provides Firefox help resources for desktop, enterprise, Android and iOS.Read 29 Sep 2026 · support.mozilla.org
Founded
2004Read 28 Sep 2026 · firefox.com
AI tools
Firefox lets users access multiple AI chatbots from one place and choose whether to use them.Read 29 Sep 2026 · firefox.com
Availability
Firefox is available in more than 90 languages, according to its download page.Read 29 Sep 2026 · firefox.com
Browser engine
geckoRead 21 Sep 2026 · mozilla.org
Built-in ad blocking
YesRead 21 Sep 2026 · mozilla.org
Cookie protection
Total Cookie Protection isolates cookies so they cannot follow users across websites.Read 29 Sep 2026 · firefox.com
Cross-device sync
YesRead 21 Sep 2026 · mozilla.org
Data choices
Users can change Firefox data collection settings on desktop and mobile and can enable Global Privacy Control.Read 29 Sep 2026 · mozilla.org
DNS protection
For some users, Firefox routes DNS requests through a resolver service whose logs are deleted within 24 hours and used only for DNS resolution.Read 29 Sep 2026 · mozilla.org
Download options
Mozilla lists Firefox Beta, Developer Edition, Nightly and Extended Support Release alongside standard desktop and mobile browsers.Read 29 Sep 2026 · firefox.com
Extension support
own_storeRead 21 Sep 2026 · mozilla.org
Extensions
Firefox extensions add browser features and tools, with thousands of free extensions available through addons.mozilla.org.Read 29 Sep 2026 · firefox.com
On-device AI
Firefox's automated translation and PDF alt-text suggestions use downloaded small language models locally, and page content, PDFs, images and tab URLs are not sent to Mozilla for those features.Read 29 Sep 2026 · mozilla.org
Open source
YesRead 21 Sep 2026 · mozilla.org
Sync
A Mozilla account can sync Firefox bookmarks, passwords and open tabs across devices.Read 29 Sep 2026 · mozilla.org
Tab Groups
Tab Groups organize open tabs by project, mood or task.Read 29 Sep 2026 · firefox.com
Tracking protection
standardRead 21 Sep 2026 · mozilla.org

Plans and prices

Firefox Free Standard browser · Windows, macOS, Linux, iOS and Android downloads Read 29 Sep 2026 · firefox.com

Every Mozilla Firefox plan and price →

Strong points and limits

Strong points

  • Free and open source
  • Available across desktop and mobile platforms
  • Syncs bookmarks, passwords, and open tabs
  • Thousands of free extensions available
  • On-device translation and PDF alt-text suggestions

Limits

  • Some users' DNS requests go through a resolver service
  • DNS resolver logs are deleted within 24 hours
  • Some data collection settings can require adjustment

Who it suits

Firefox may suit readers who want a free, open-source browser with tracking protection, ad blocking, and cross-device sync. Its extensions and optional AI tools may also appeal to people who want to add browser features or choose among chatbots.

Verdict

Firefox combines cross-device sync with cookie isolation, extensions, and configurable data choices. Its privacy notice also describes exceptions and DNS handling, so readers should review those details against their preferences.

Where Specifiction places it

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