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Basilisk 52.9.2026.11.01

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.

filecart Windows Updated Nov 02, 2026
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About Basilisk

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.

License: MPL-2.0
Release info Update on Nov 02, 2026
Release notes UXP Changes:
- Removed compromised eMudhra certificates from the certificate store.
- Updated SQLite to 3.54.1.
- Updated the executable extensions list to warn about additional types of files.
- Fixed several potential application crashes.
- Restricted JAR loading to align better with in-browser usage.
- Fixed an issue with potential out-of-bounds access in JavaScript.
- Disabled the new :has() CSS implementation by default for performance reasons. See implementation notes.
- Added a preference for handling improper form element placement in HTML. See implementation notes.
- Backported an upstream libvpx VP8 decoder fix.
- Fixed an issue in the BigInt implementation that caused specific JavaScript calls to fail.
- Fixed a potentially exploitable memory leak.
- Security issues addressed: CVE-2026-109730 (DiD), CVE-2026-109735, CVE-2026-109736, CVE-2026-109782, CVE-2026-109763, CVE-2026-109776 (DiD), CVE-2026-100822, CVE-2026-100783, CVE-2026-100773 (DiD), CVE-2026-96869 (DiD), CVE-2026-100791, and several others that did not have a CVE designation at the time of evaluation.

Basilisk Changes:
- Introduced Intel 32-bit macOS builds for OS X 10.6 and later. These builds do not support automatic updates.
- Enabled automatic updates for MIPS64EL Linux builds.
- Built on UXP commit: 6b18be917d

Included Polyfills:
- This release includes the following polyfills:
- image.decode
- Intl.DisplayNames
- Intl.RelativeTimeFormat
- Intl.Segmenter
- en-US only Intl.ListFormat
- Microsoft-specific (Outlook, Azure, etc) webauthn shim
- TextDecoderStream
- TextEncoderStream
- TransformStream
- ReadableStream pipeTo
- ReadableStream pipeThrough
- getAnimations
- elementFromPoint finite values

UXP Implementation Notes:
- The CSS :has() pseudo-class selector was disabled by default because it caused severe performance issues on websites. This reduces web compatibility for some sites, but should improve browser performance while the root cause is investigated. The feature is expected…
Related tags browser internet web web-browser webpage
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