LessWrong (Curated & Popular)

"Open sourcing a browser extension that tells you when people are wrong on the internet" by lc

Published: February 26, 2026

Duration: 3:35

Example of OpenErrata nitting the Sequences I just published OpenErrata on GitHub, a browser extension that investigates the posts you read using your OpenAI API key and underlines any factual claims that are sourceably incorrect. Once finished, it caches the results for anybody else reading the same articles so that they get them on immediate visit. If you don't have an OpenAI key, you can still view the corrections on posts other people have viewed, but it doesn't start new investigations.

I've noticed lately that while people do this sort of thing by pasting everything you read into...