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This Month in Ladybird – June 2026

Ladybird's June 2026 update reports progress on browser engine improvements, including better CSS support and JavaScript performance, as well as continued work on the web platform and developer tooling.

Background

- Ladybird is an independent, cross-platform web browser started in 2022 by Andreas Kling (former Apple engineer who worked on WebKit/Safari). It is written from scratch (not based on Chromium, Firefox, or WebKit) and funded by donations. - The project gained wide attention after a June 2024 fundraiser where it raised over $1 million in a few days, mostly via GitHub Sponsors. It is now a registered US 501(c)(3) nonprofit, Ladybird Browser Initiative. - Ladybird uses its own engine called LibWeb and a custom JavaScript engine (LibJS). It does not use any code from Chrome, Safari, or Firefox, making it a rare "truly independent" browser effort. - As of 2026, Ladybird is still in pre-alpha development — it can render many modern websites but lacks key features like extensions, password managers, and comprehensive mobile support. This newsletter reports monthly progress to its community of supporters.

RT Sean Bowe: Zcash's new formal verification efforts eliminate undetectable counterfeiting bugs from the new Ironwood pool.
6.0
Zcash's formal verification efforts have eliminated undetectable counterfeiting bugs from the new Ironwood pool, ruling out such vulnerabilities up to the underlying cryptographic assumptions, as part of Project Tachyon.
RT Dev 🧪: Zcash testnet is updating for Ironwood tomorrow! We have two independently developed consensus implementations of it. One by @valargroup,...
3.5
Zcash testnet is updating for Ironwood with two independently developed consensus implementations, one by Valar Group (in audit) and another by the Zcash Foundation. Users can try a desktop wallet fork with migration code, and Keystone dev device users can update firmware to test signing 11+ transactions with a single QR code.
The other kind of control flow guard check: The combined validate and call
0.5
Raymond Chen explains a specific type of Control Flow Guard (CFG) check that combines validation and function calling into a single operation, describing how this "combined validate and call" approach works as a two-in-one package within Windows security mechanisms.
June 2026 newsletter
0.5
Simon Willison's June 2026 sponsors-only newsletter is now available, covering topics such as Claude Fable 5, GPT-5.6, US export restrictions, GLM-5.2, Datasette Apps, and various model releases. The newsletter is accessible to GitHub sponsors, with a $10/month sponsorship option to stay a month ahead of the free copy.

This Month in Ladybird – June 2026

Background

Related stories

RT Sean Bowe: Zcash's new formal verification efforts eliminate undetectable counterfeiting bugs from the new Ironwood pool.

RT Dev 🧪: Zcash testnet is updating for Ironwood tomorrow! We have two independently developed consensus implementations of it. One by @valargroup,...

The other kind of control flow guard check: The combined validate and call

June 2026 newsletter