Zen Browser Review

Zen is a Firefox-based browser whose repository describes the aim of pushing your productivity to a new level. The website lists its main features: workspaces for separating tabs by project, a compact mode that hides the tab bar when it is not needed, Glance for quickly peeking at links, split view for two tabs side by side, and Zen Mods to customize appearance and behavior. The site describes the browser as privacy-focused and says it cares about your experience, not your data, but it does not detail specific mechanisms, and the page did not mention sync, extensions, or Firefox compatibility, which we could not confirm there. The GitHub repository shows release builds based on Firefox 158.0 and Twilight builds based on Firefox RC 158.0, translations through Crowdin, and about 7,100 commits on the dev branch. The code is MPL-2.0, the same family of license as Firefox.

Download builds from the project's website or GitHub releases. Because it is based on Firefox, installing it is like installing any other desktop browser. We did not confirm platform availability from the site we read, so check the download page for your operating system.

The experience centers on a rearranged browser interface: a sidebar for tabs and workspaces, a compact mode to reclaim screen space, and quick features such as split view. People who like the Arc browser's approach will find it familiar in spirit. We have not used it hands-on for this review.

• Workspaces for organizing tabs by project
• Compact mode that hides the tab bar
• Glance for quick previews
• Split view for two tabs side by side
• Zen Mods for customization
• Built on Firefox with regular upstream updates

• Productivity-oriented interface on a mature browser engine
• Open source with an active community, about 45,000 stars and daily commits
• Free, with Firefox's upstream security updates
• Tracks Firefox releases closely

• The project site is light on specifics about sync, extensions, and privacy details
• Being a Firefox derivative means it depends on upstream and on a small team for patches
• Features are still evolving, and the site mentions a beta channel
• Not a fit for enterprise management requirements

Zen is free and open source under the MPL-2.0. There is no paid tier.

Arc, from The Browser Company, popularized sidebar tabs and spaces but is a proprietary Chromium-based browser. Zen offers a similar workflow on Firefox's engine and is open source, trading Arc's polish and ecosystem for transparency and free software.

• Power users who juggle many tabs and projects
• Firefox users who want a more modern layout
• People who prefer an open-source browser

• Organizations needing centrally managed browsers
• Users who depend on Chromium-only extensions
• Anyone who wants a long-established vendor behind the browser