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Build a small browser extension

“I wish my browser did one extra little thing for me.”

Browser extensions are a great first project: small, useful, and an AI builder can scaffold one in an afternoon. Expect a few build-break-fix rounds.

Fix it yourself in 3 steps

  1. Describe the one job in a sentence (e.g. 'keep my notes floating over any page') and which browser.
  2. Ask a coding agent to build the smallest version, then load it unpacked in your browser to try it.
  3. Before publishing to the store, ask it to list every permission the extension requests and why.

Copy this prompt

Build a [Chrome/Safari] extension that [one job]. Use the fewest permissions possible and explain each one. Give me step-by-step instructions to load it unpacked and test it. Stop there — don't publish it or create any store accounts.

Fill in the [brackets]. Each prompt says when the AI should stop, so it doesn't wander off.

Agents people used for this: Replit Agent, ChatGPT.

Inspired by real examples collected at agentusecases.ai.

📚 2 real stories of people doing this with AI agents

Collected at AgentUseCases.ai.

Tools for this

#1 · Our pick

Replit Agent

Best for: Zero-setup build + host

An agent that builds and hosts the app in one place. Nothing to install, which is the whole point.

Visit Replit Agent ↗
#2

ChatGPT

Best for: Widest feature set

OpenAI's assistant with the broadest feature set: voice, images, search and a large app ecosystem.

Visit ChatGPT ↗