Lightpanda

@lightpanda
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35 Posts

A new browser built for machines. Not a fork. Not a patch.

Come chat: discord.gg/K63XeymfB5

Browsers waste time loading scripts one at a time.

We shipped <link rel=preload as=script> support so Lightpanda now starts downloading blocking scripts up front instead of as the parser hits them.

Same page, same network, six scripts, each delayed 300ms server-side:

Old build: 1813ms
New build: 606ms

https://gist.github.com/katie-lpd/aea8c50b37f104a010d0c48897b5e9d7

File uploads now work in Lightpanda! ๐Ÿ—ƒ๏ธ

Attach a file to an input[type=file], submit, and Lightpanda encodes it as multipart/form-data, same as a real browser.

github.com/lightpanda-io/demo/blob/main/puppeteer/form_file.js

https://github.com/lightpanda-io/demo/blob/main/public/form/input_file.html

We already have the fastest engine. These three releases are what let agents feel it
Our MCP leaned on markdown, dumping 10-30KB of page text per call vs. agent-browser + Lightpanda that favors smaller tool calls like semantic tree

Lightpanda now implements the CookieStore web API ๐Ÿช

It's the modern async way to read and write cookies, instead of parsing document.cookie strings by hand.

We also cleaned up cookie ownership under the hood, which removes a double-free risk on certain error paths so sessions stay stable when things go wrong.

Slack, crypto exchanges, live dashboards: all push real-time data through a WebSocket inside a Web Worker.

Lightpanda can run that path now.

Below: a Worker hitting Binance, BTC trades streaming into the terminal.

PR: http://github.com/lightpanda-io/browser/pull/2540
Code: https://gist.github.com/katie-lpd/4a17b62818ddf5117db07b108762b2f0

Lightpanda is now a browser backend in Hermes by Nous Research.

Open source autonomous agent. Open source browser built for machines.

It had to be done.

Set Lightpanda as default with automatic Chrome fallback.

https://github.com/NousResearch/hermes-agent/pull/7144

The web platform test flywheel is officially in motion

600k -> 1.4m in 1 week

Having fun benchmarking Chrome vs Lightpanda on agent-browser

๐Ÿงจ

300k -> 600k passing wpt tests

๐Ÿš€