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How I used GitHub Copilot to build a browser extension

Here’s how, in seven steps, I built my first browser extension with GitHub Copilot—and my three major takeaways about learning and pair programming in the age of AI. I’ve built a [rock, paper, scissors game with GitHub Copilot](https://github.com/blackgirlbytes/rock-paper-scissors-copilot) but never a browser extension. Create the manifest.json 🧾](https://github.blog/developer-skills/github/how-i-used-github-copilot-to-build-a-browser-extension/#2-create-the-manifest-json-%f0%9f%a7%be) 🧑🏾‍💻 Inside a folder in my IDE, I created a file called manifest.json.

Agent or tool
GitHub Copilot
Topic
Sales & Marketing
Reported on
Blog (GitHub)
Added
2026-11-11

Why it matters

Sales and marketing run on research, lists and follow-ups. Agents are starting to take on that groundwork, freeing people for the conversations that actually close deals. It is one of 613 sightings filed under Sales & Marketing on Agent Sightings (number 335 by interest), and one of 47 involving GitHub Copilot.

How you could try it

Here is a reusable prompt, written by us in our own words, that captures the task. Paste it into GitHub Copilot or any similar agent and adjust the details to your situation.

I want an agent to do the research and drafting for this sales or marketing workflow, and stop for my approval before anything is sent. The tool in the source case was GitHub Copilot.

Saved

Tip: Start small: run it once on a low-stakes example, read what the agent did, and only then let it run on real work.

Source

Read the original first-hand account on Blog (GitHub): https://github.blog/developer-skills/github/how-i-used-github-copilot-to-build…. Our summary is a paraphrase; details are in the source.

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