Karpathy: one prompt to Claude Code deploys a YouTube thumbnail-swap browser extension
amaarora · x · 2026-11-03
Responding to the HackerTube thumbnail discussion, Karpathy shares a hands-on tip: just tell Claude Code 'Create and deploy an extension for my browser that shows YouTube thumbnails from halfway of the video instead of the user-uploaded version. Include a toggle between the two' — he says it works great. One prompt produces a working, deployed browser extension.
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