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 as an application is primarily a vessel for development of the XUL platform it builds upon, and additionally a potential replacement for Firefox to retain the use of Firefox Extensions.
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 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 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.
Basilisk is a modern, full-featured web browser and as such requires a reasonably modern system to properly run.
Windows 7 or later. Windows XP or Windows Vista are not supported.
1GB of RAM (2GB or more recommended for heavy use).
Dedicated GPU strongly recommended.
A modern processor (must have SSE2 support as the absolute minimum)
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, our XUL platform in development. As such XUL is alive and well in this browser and will not be deprecated.
Has some long-standing known issues with the Mozilla code-base fixed (e.g. CVE-2009-1232).
Does not use Rust or the Photon user interface. You can expect a familiar interface as-carried by Firefox between v29 and v56.
Does not use Electrolysis (e10s, multi-process browsing).
Does not require walled-garden extension signing.
This is a development, bugfix and security update.
Enabled brotli compression for http for sites that support it.
Implemented EventTarget as a constructor.
Updated Windows 10 toolkit styling.
Updated the port blacklist (removed 10080).
CSS: Implemented calc() and animation support for stroke-dashoffset.
Added support for checking boolean preferences to chrome CSS style sheets, to support more advanced theming options.
Added support for dynamic dark color capable themes in CSS.
Updated ResizeObserver implementation to a more recent specification.
Removed a metric ton of Macintosh code.
Removed obsolete system theme support from the layout engine.
Fixed several crashes.
Linux: blocked particularly old versions of Mesa/Nouveau drivers due to issues.
Security issues addressed: CVE-2021-30547 and several other issues that don’t have a CVE number.
Unified XUL Platform Mozilla Security Patch Summary: 3 fixed, 3 DiD, 2 deferred (DiD), 12 not applicable.