🧩 CODE · Coding & Dev Level: Beginner ⏱ 30 MIN Freemium

Build and Load Your Own Custom Chrome Extension in 30 Minutes with Cursor

Turn repetitive browser chores—highlighting, text extraction, side-panel summarization—into a Manifest V3 Chrome extension generated by Cursor and loaded locally in seconds.

CORE TOOLS Cursor / Claude, Chrome Browser

BEST FOR Web-heavy operators, researchers, support staff, PMs and productivity enthusiasts

REQUIREMENTS Chrome or Edge browser; Cursor or any LLM chat tool

✦ WHY THIS WORKFLOW

When building an extension for yourself or your team, you do not need store approval or complex bundlers. Plain JS files generated by AI run immediately in Developer Mode.

✦ Interactive Workflow Animation Preview

Step-by-Step Action Checklist

0 / 4 Completed

✓ Step 1 [Define one focused feature]: Open an empty folder in Cursor and pick one concrete task (e.g., summarize selected text in a side panel).
✓ Step 2 [Generate pure Manifest V3 files]: Ask AI to create `manifest.json`, `content.js`, `popup.html` and `background.js` in plain JS without complex bundlers.
✓ Step 3 [Load unpacked in Chrome]: Visit `chrome://extensions`, enable Developer Mode, click "Load unpacked" and select your folder to test immediately.
✓ Step 4 [Paste errors to iterate]: Copy any extension error logs or console messages back into Cursor to refine permissions and UI in two turns.

READY-TO-USE PROMPT TEMPLATE

Open Official Tool / Repo ↗

Build a lightweight Chrome Manifest V3 extension using plain HTML/CSS/JS (no Webpack/Vite build step so I can load it unpacked directly).
Core feature: [describe your feature, e.g., format selected text + page title + URL into a clean Markdown note and copy to clipboard].
Output:
1) File tree;
2) Complete code for `manifest.json` (minimal permissions), `background.js`, `content.js` and a clean `popup.html`;
3) Instructions to load and test.

Use Cases & Tags:

Selection-to-AI popupOne-click table/image extractorCustom distraction blockerInternal admin form helper#manifest v3

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