Introduction
In August 2026, Ladybird took significant strides, cementing its position as a browser of choice for performance-conscious users and developers. This month, we've expanded video support, optimized engine performance, and integrated new development features. Let's dive in.
Expanded Video Support
Ladybird made a leap forward in video compatibility. With the addition of Media Source Extensions, the browser can now play fragmented MP4 videos and supports AVC (H.264), HEVC (H.265), AV1, and AAC codecs. This allows better compatibility with platforms like Twitch and Plex. For example, videos on YouTube, which were already partially compatible thanks to VP9/Opus in WebM, now benefit from improved support for older formats and higher resolutions such as 8K often served in AV1.
Playback Bug Fixes
We also resolved several playback bugs: YouTube video card previews no longer crash, players using preload="none" no longer hang, and HLS.js-based players start correctly.
Engine Performance Enhancements
In August, the focus was on sustainable engine performance improvements. A new style engine, layout caching, and moving CSS animations off the main thread are key steps. These enhancements lead to a smoother, more responsive user experience.
Transition to Rust
CSS parsing and the painting pipeline have been migrated to Rust, a language renowned for its safety and performance. This strengthens the browser's robustness and reduces the load on the main thread.
New Development Features
JavaScript Debugging
Developers can now leverage JavaScript debugging in Ladybird. This feature allows setting breakpoints, stepping through code line by line, and evaluating watch expressions. While Wasm debugging and DOM mutation breakpoints are not yet available, the core workflow is functional.
Downloads and Session Restore
Downloads can now be paused and resumed, even after a browser restart, provided the server supports it. Additionally, session restore has been enhanced to retain the full tab history, including back/forward state.
New Sponsors
Ladybird is supported by generous sponsors, and this month, we welcome Arnav Guleria with a $5,000 donation. Their support continues to be crucial for our development.
Conclusion
August 2026 was a month of significant progress for Ladybird, with enhancements that bolster its competitiveness and appeal to both users and developers. Let's discuss your project in 15 minutes.