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 small bugfix update.
Changed the version of NSS to a custom build to address certificate import and (hopefully also) keygen issues.
Updated the embedded emoji font for Yet More Professions With All Skin Colors&tm;.
Updated the YouTube Studio useragent for compatibility.
This is a development, bugfix and security update.
Fixed an issue with useragent updates.
Folder uploads through input elements now require user interaction on Windows 10.
Mitigated a potential problem with history location/state change updates if used in rapid succession.
Fixed a problem with WebCrypto failing to work properly with AES-GCM.
Updated various libraries for compatibility and security.
Fixed several memory safety hazards and potential browser crashes
Security issues fixed: CVE-2021-23973, CVE-2021-23974.
Unified XUL Platform Mozilla Security Patch Summary: 4 fixed, 2 defense-in-depth, 19 not applicable.