Simon Willison’s Weblog

Tutorial: Creating a Mozilla Extension (via) I spent nearly an hour looking for this the other day with no success.

Posted 14th July 2004 at 8:17 pm

Recent articles

I think "agent" may finally have a widely enough agreed upon definition to be useful jargon now - 18th September 2025
My review of Claude's new Code Interpreter, released under a very confusing name - 9th September 2025
Recreating the Apollo AI adoption rate chart with GPT-5, Python and Pyodide - 9th September 2025

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