Calm, privacy-first browser on Firefox
Zen Browser Team · Browsers & Internet
Rating
—
No public ratings yet
Trust
7/9
of nine checks verified · Jul 19, 2026
Platforms
1
macOS, Windows, Linux
Licence
MPL-2.0
Browsers & Internet
Independently checked by Altapp where possible; developer-reported data is labeled as such. Last full review: Jul 19, 2026.
Open source under MPL-2.0, developed in public on GitHub.
The team removes Firefox's telemetry and states it collects no personal data.
A young, fast-moving community fork rather than an independently audited product.
Verification reflects the version listed above. Practices may change between releases. How we verify ›
Our verdict: a calm, well-designed Firefox fork that brings vertical tabs, workspaces, and split view to Gecko — capable and privacy-minded, but a young, fast-moving community project with no independent security audit yet.
Zen Browser is a free, open-source desktop browser built on Mozilla Firefox and its Gecko engine. It reworks the interface around vertical tabs in a collapsible sidebar, Workspaces for separating tabs by context, Split View for side-by-side tiling, Glance link previews, and a Compact Mode for a distraction-free window. It keeps full Firefox extension compatibility and adds deep theming through Zen Mods.
Because it is a Firefox fork, Zen inherits Mozilla's rendering engine and built-in privacy protections while the team strips Firefox's telemetry and states it collects no personal data — with their own caveat that some may remain. It is a young, fast-moving community project: releases ship frequently on a beta line, there is no formal third-party security audit yet, and the optional Sync feature reuses Firefox Sync (end-to-end encrypted, stored on Mozilla's servers).
Private browsing without compromise
Choose Brave if
you want built-in ad-blocking with zero setup on a Chromium base.
Independent open-source web browser
Choose Firefox if
you want the mature, Mozilla-backed browser Zen is built on.
Privacy-hardened independent Firefox fork
Choose LibreWolf if
you want hardened, telemetry-free privacy defaults out of the box.
No reviews yet — be the first.
Loading…
Yes — the pricing listed at our last review is “Free · open source”.
Altapp's independent Trust Report (last full review Jul 19, 2026) records 7/9 of nine checks verified, covering source verification, data & permissions, and known risks. Altapp publishes no score or grade of its own — the count is a tally of what could be independently confirmed, and verification reflects the version listed on this page.
macOS · Windows · Linux.
Brave, Firefox, LibreWolf — each with its own verified Trust Report on Altapp. See the full list ›