Additional Information

This browser is a close twin to pre-Servo Firefox in how it operates!

Latest Version Basilisk Browser 2023.11.09 (64-bit)

Windows 7 64/Windows 8 64/Windows 10 64/Windows 11

Updated December 13, 2023
Author Moonchild Productions
Category Browsers and Plugins
License Freeware
Language English
Download 333


Basilisk Browser 64bit 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. The tool is a modern, full-featured web browser. It aims to retain useful technologies that its sibling Firefox has removed.

The app is primarily a reference application for the development of the XUL platform it builds upon, and additionally a potential replacement for Firefox.

Basilisk is a 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 Software community project, it comes without any warranty or promise of fitness for any particular purpose. "That being said: of course we will do best to provide an as stable and secure browser as possible with every official release of Basilisk Browser 64-bit for PC".

It should be noted that because of this focus on platform development, 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. As the platform develops, some Firefox-specific features may be dropped; please do not expect this application to remain the same, forever.

Features and Highlights
  • Full support for JavaScript's ECMAscript 6 standard for modern web browsing.
  • Support for all NPAPI plugins (Unity, Silverlight, Flash, Java, authentication plugins, etc.).
  • Support for XUL/Overlay Mozilla-style extensions.
  • Experimental support for WebExtensions (in gecko-target mode). Please note that some Mozilla-specific WebExtension APIs are not yet available.
  • Support for ALSA on Linux.
  • Support for WebAssembly (WASM).
  • Support for advanced Graphite font shaping features.
  • Support for modern web cryptography: up to TLS 1.3, modern ciphers, HSTS, etc.

Important differences with Mozilla Firefox:

  • Uses Goanna as a layout and rendering engine. Goanna behaves slightly differently than Gecko in certain respects and may result in different display of web pages. e.g.: Goanna renders gradients in a more accurate color space (non-premultiplied).
  • Builds on UXP, XUL platform in development. As such XUL is alive and well in this internet browser and will not be deprecated.
  • Has some long-standing known issues with the Mozilla code-base fixed (e.g. CVE-2009-1232).
  • It does not use Rust or the Photon user interface. You can expect a familiar interface as-carried by Firefox between v29 and v56.
  • It does not use Electrolysis (e10s, multi-process browsing).
  • It does not require a walled-garden extension signing.

Previous versions More »

2023.11.09 December 13, 2023 42.3 MB 2023.11.05 November 07, 2023 42.3 MB 2023.10.03 October 05, 2023 42.4 MB 2023.09.15 September 17, 2023 42.4 MB 2023.09.12 September 14, 2023 42.4 MB 2023.07.18 July 20, 2023 42.4 MB