Waterfox

Definition

Waterfox is an open-source web browser built from the Firefox codebase, positioned around privacy defaults and continued support for some legacy extension compatibility while otherwise tracking modern Gecko engine updates. Unlike browsers that diverge onto their own forked engine, Waterfox stays closer to current Firefox releases, applying its own configuration, branding, and telemetry changes on top of that shared foundation.

Overview

Waterfox was created to offer a Firefox-based browser with privacy-oriented defaults, such as disabled telemetry and additional built-in tracking protection, for users who liked Firefox's engine and compatibility but wanted less data collection and more configuration out of the box without installing extra extensions or add-ons themselves to reach the same result. Mechanically, Waterfox builds on top of Mozilla's Gecko engine and generally follows Firefox's underlying rendering and JavaScript engine updates, unlike forks such as Pale Moon that maintain a separately patched engine fork. This keeps Waterfox closer to current web standards support than Gecko forks that diverge from upstream, while still allowing Waterfox's maintainers to strip telemetry, adjust default settings, and ship their own branding independent of Mozilla. Among Firefox derivatives, Waterfox sits between browsers that track Firefox closely for compatibility, like some regional or accessibility-focused forks, and browsers that fork the engine itself, like Pale Moon and Basilisk. Waterfox's classic legacy branch also offered continued support for older XUL extensions for a period, occupying a middle position between old and new extension ecosystems during that transition. In practice, Waterfox is used by privacy-conscious users who want a Firefox-like browsing experience with reduced default data collection, and by users who prefer an independently governed browser rather than one controlled by a large browser vendor, while still benefiting from Gecko's ongoing web standards development and Mozilla's underlying engineering work. Because Waterfox is maintained by a much smaller team than Mozilla, updates can lag behind official Firefox releases, and its privacy and business model, including past sponsorship arrangements, has drawn scrutiny from some users comparing it to Mozilla's own privacy commitments; evaluating a fork's maintenance pace and governance is a reasonable step before adopting it as a primary daily browser. Waterfox also illustrates a broader pattern among Firefox derivatives: staying close to upstream Gecko trades some independence for faster access to new web platform features and security patches than a fully diverged fork can offer. That positioning has made Waterfox a common recommendation for users who want a privacy-hardened browser without leaving the broader Gecko-based compatibility and extension ecosystem that Firefox itself maintains. Because it remains closely aligned with current Firefox releases, most WebExtensions built for Firefox also install and run on Waterfox with little or no modification required by their developers, which lowers the practical switching cost for anyone moving over from a stock Firefox installation and simplifies extension maintenance for developers who support both browsers.

Key Features

• Built on the Firefox codebase using the Gecko rendering engine
• Privacy-oriented default settings with telemetry disabled out of the box
• Independent governance separate from Mozilla Corporation
• Closer tracking of current Gecko updates than engine-forking alternatives
• Legacy branch historically offered continued classic extension support
• Cross-platform availability on Windows, macOS, and Linux
• Built-in tracking protection enabled by default

Use Cases

Alternatives

Frequently Asked Questions

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