You.com Omnibox от Adam Lui, KudoAI

Super lightweight add-on (<100 KB) that lets you type @you in the address bar to get results from You.com AI!

Open source code: https://github.com/KudoAI/you.com-omnibox
Support: https://github.com/KudoAI/you.com-omnibox/issues

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More AI add-ons:

https://www.aiwebextensions.com