Basilisk Browser 2026.06.12 (64-bit)

Basilisk Browser 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.

Key Features:

• Full support for JavaScript's ECMAScript 6 standard, ensuring compatibility with modern web technologies.
• Comprehensive support for NPAPI plugins, including Unity, Silverlight, Flash, Java, and authentication plugins.
• Compatibility with XUL/Overlay Mozilla-style extensions for enhanced customization.
• Native ALSA support on Linux for better audio handling.
• WebAssembly (WASM) support for high-performance web applications.
• Advanced Graphite font shaping capabilities for improved text rendering.
• Modern web cryptography support, including TLS 1.3, modern ciphers, and HSTS.
• Optional GTK2 and GTK3 support at compile time on Linux.

Key Differences from Mozilla Firefox:

• Utilizes the Goanna rendering engine instead of Gecko, leading to subtle differences in webpage rendering, such as more accurate gradient color spaces.
• Built on UXP (Unified XUL Platform), keeping XUL fully functional and actively developed.
• Addresses long-standing security issues from the Mozilla codebase, such as CVE-2009-1232.
• Does not use Rust or the Photon UI, maintaining a familiar interface similar to Firefox versions 29-56.
• Does not implement Electrolysis (e10s) for multi-process browsing.
• No requirement for extension signing within a controlled marketplace, allowing unrestricted use of add-ons.

How to Use

• Download this browser from the official website or FileHorse
• Install the browser by following on-screen instructions
• Open Basilisk Browser from the desktop or start menu
• Configure settings in the preferences menu if needed
• Browse the web using the address bar and search options
• Manage bookmarks and history for quick access
• Customize extensions and themes for better experience
• Enable privacy settings for secure browsing
• Use developer tools for advanced web development
• Keep the browser updated for best performance

Alternatives

Opera GX: The gaming browser built for gamers with RAM and CPU limiters!

Chrome: The fast, free browser that`s built for the modern web

Firefox: Fast and customizable browser with a strong focus on privacy and security.

Edge: A modern and efficient browser with excellent compatibility and integrated Microsoft services.

Brave: Privacy-focused browser that blocks ads and trackers by default, ensuring a faster and more secure browsing experience.

System Requirements

• OS: Windows 7, 8, 10, 11 (64-bit recommended)
• Processor: Intel or AMD dual-core processor
• RAM: 2GB minimum, 4GB recommended
• Storage: 200MB free disk space
• Internet: Required for downloading and updates

PROS

• Open-source and customizable
• Supports legacy Firefox extensions
• No forced updates or telemetry
• Fast performance with lightweight design
• Privacy-focused with strong security controls

CONS

• Limited support for newer web technologies
• Fewer extensions compared to mainstream browsers
• No built-in support for DRM content
• Can be unstable with certain websites
• Lacks official support from major web services

Download Basilisk Browser Latest Version Why is this app published on FileHorse? (More info)