Mozilla Firefox vs Zen Browser
Mozilla Firefox
firefox.com
Zen Browser
zen-browser.appSide by side
| Figure | Mozilla Firefox | Zen Browser |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | Yes | Yes |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Web browsers | 9.0 (#11) | 8.6 (#32) |
| Availability | Firefox is available in more than 90 languages, according to its download page. | Zen is available for macOS, Windows, and Linux, and the download page says it is currently in beta. |
| Cross-device sync | Yes | Yes |
| Extensions | Firefox extensions add browser features and tools, with thousands of free extensions available through addons.mozilla.org. | Zen supports extensions from Mozilla Add-ons, but Firefox themes are not supported. |
| Free plan | Yes | Yes |
| Open source | Yes | Yes |
| Supported platforms | both | desktop |
| Product | Firefox is a web browser that Mozilla describes as fast, private and useful across devices. | Zen is a privacy-focused web browser designed to help users stay productive and focused. |
| Security | Firefox uses Google Safe Browsing to protect against malicious downloads and phishing attacks, and validates web pages and technical data with certificate authorities. | The security documentation says Zen uses OCSP, HTTPS-Only Mode, protection against deceptive content and dangerous software, and treats unsafe SSL connections as broken by default. |
| Support | Mozilla provides Firefox help resources for desktop, enterprise, Android and iOS. | Users can report browser bugs on GitHub, and the FAQ says the small team may take time to review requests and prioritizes critical and popular issues. |
| Tracking protection | standard | Tracking Protection offers Standard, Strict, and Custom levels, and DNS over HTTPS offers Default, Increased, and Max Protection levels. |
Plans
In their own words
Mozilla Firefox
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.
Zen Browser
Zen Browser has no write-up on Specifiction yet; its figures are above.