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LightPanda 1.0

lightpanda.io19 points6 comments
Screenshot of LightPanda 1.0

Lightpanda 1.0 is a headless browser engine released out of beta after two years and roughly 10,000 commits, designed for scale and security. Written in Zig with no graphical rendering, it runs modern JavaScript using V8 15.5.35.13 while using far less memory and CPU than Chrome. It integrates with Puppeteer, Playwright, Selenium, ChromeDP, and is available via pip/npm or a native MCP server. Conformance-wise it passes 1,739,845 Web Platform Tests subtests (about 80% of Chrome’s 2,184,491), with most remaining gaps in CSS/painting suites that Lightpanda intentionally omits. It’s already used in production by AI agents, search and indexing customers who report multi‑fold speed and cost gains.

The release makes CORS enforcement default for fetch/XMLHttpRequest and documents why that matters for headless browsers driven by unvetted agent code; Lightpanda currently passes 371/463 cors/ subtests. Recent security hardening includes opt-in resource loading, stripping Authorization on cross-origin redirects, stricter cookie handling, network filtering, and parser/protocol fixes. Several integrations (Hermes Agent, agent-browser) and customer migrations (DeveloperHub.io, Keenable) demonstrate practical performance and stability benefits. Development will continue to expand Web API coverage and WPT pass counts while preserving speed and low memory use.

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