A XUL-based web-browser built on top of the Unified XUL Platform (UXP).
This browser is a close twin to pre-Servo Firefox in how it operates.

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Welcome to the Basilisk home page!

Basilisk is a free and Open Source XUL-based web browser, featuring the well-known Firefox-style interface and operation. It is based on the Goanna layout and rendering engine (a fork of Gecko) and builds on the Unified XUL Platform (UXP), which in turn is a fork of the Mozilla code base without Servo or Rust.

Basilisk is Back!

Basilisk is no longer developed by the Pale Moon team. It is now developed by a team of developers independent from the Pale Moon project. Click here to learn more.

Basilisk is intended to be a potential replacement for pre-Servo versions of Firefox. It can also be considered a reference implementation for building a browser on top of the UXP platform.

Basilisk is development software. This means that it should be considered more or less "beta" at all times; it may have some bugs and is provided as-is, with potential defects. Like any other Free and Open Source Software community project, it comes without any warranty or promise of fitness for any particular purpose. That being said: of course we will do our best to provide an as stable and secure browser as possible with every official release of Basilisk.

It should be noted that the browser itself (the application code) will be released and maintained mostly as-it-is, with very little change or development on the user interface or browser front-end features. That being said, we will accomodate user requests for new features as long as they are reasonable and are not significant changes that modify the user interface in complex ways. As the UXP platform develops, some Firefox-specific features may be dropped; please do not expect this application to remain the same, forever.

To put it simply, Basilisk does not change for the sake of change. We only make changes if we actually feel they are beneficial for users, unlike Mozilla who treats Firefox's interface as if it is a fashion show with new designs every week.

What does this browser support?

Basilisk supports a wide array of features required for the Modern Web, including advanced scripting, WebRTC, CSS v3, HTML5 and downloadable font support.

It also fully supports all NPAPI plugins (e.g. Java, Unity web player, Media plugins, Authentication plugins).

XUL extensions are also supported. Most XUL extensions compatible with Firefox 52 should work.

Further details can be found on the features page.

Is this browser associated/affiliated with Mozilla?

In one word: No.

This browser is currently developed by the Basilisk Browser Development Team, and is a fully independent fork of the Mozilla/Firefox code.

This browser was originally created by the team behind the Pale Moon Browser.

Release notes

You can find the release notes for the browser here.