Ladybird Browser Unveils Major Overhaul: New Tech, Enhanced Features, and Improved Performance
November 4, 2026
In October 2026, Ladybird rolled out architectural improvements that separate style and layout from JavaScript, introduce a new LibJS JIT and a dedicated WebAssembly engine, redesigned UI, progress on Web Platform Tests, and ongoing work on security, media, Rust migration, and alpha readiness.
The browser gained features such as early support for VoiceOver and Orca, spell checking, Picture-in-Picture, link-to-text, location and microphone permissions, DevTools enhancements, and improved find-in-page capabilities.
Usability and compatibility gains include better performance for Google Slides, GitHub Mermaid diagrams, larger ChatGPT text boxes, bot checks for nytimes and Reuters, faster Instagram first-frame loading, Gmail reload behavior improvements, and enhanced x86CSS usability.
Style and layout now run on separate threads from JavaScript, with paint recording on another thread, enabling CSS animations and :hover effects to keep running while JavaScript executes.
Wasm engine replaced with a newer engine that has its own interpreter and JIT, supporting exception handling and garbage collection, delivering meaningful performance gains on JetStream 3 workloads.
Media workload improvements include Windows video playback, YouTube support, hardware decoding via Vulkan on Linux, and better native MP4 reading.
Security and process isolation enhancements introduce sandboxed renderer processes, per-site top-level process separation, and per-site network processes to limit damage from compromised renderers.
Expanded Web APIs and tooling include HTML Sanitizer API, Touch Events, Cross-Origin-Opener-Policy, Paint Timing, Event Timing, broader canvas support, and WebDriver BiDi integration.
Linux and macOS now see a JavaScript JIT driven by runtime type profiling and inlining, aiming for tangible practical speed improvements.
The LibJS and Wasm engine are migrating from C++ to Rust, with core components like WebGL, 2D canvas, IndexedDB, and URL handling moved over, while the flap interpreter remains in use for now.
A new browser UI design is finalized, detailing tabs, toolbars, menus, and themed private windows, along with improvements to tab management, form controls, and scrolling behavior.
Web Platform Tests as of late October show Safari Technology Preview passing, with total subtests reaching over 2.18 million by month end and most gains in CSS and editing tests.
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