A
Cursor logoCursorBuild and ship a Manifest V3 browser extension

Chrome Extension MV3 Builder

Setuproll editorial@setuproll
87.0Overall score

Wires Cursor into the quirks of Manifest V3: service-worker lifecycles, content-script isolation and the permission model that trips up most first extensions. For developers who want a working, store-ready extension without reading the whole Chrome docs tree.

87.0Score
5Components

Install this build

Export
terminal
npm create wxt@latest my-extension

Components

Model

  • Claude Sonnet 4.6

MCP servers

  • filesystem
  • github
  • playwright

Subagents

  • manifest-planner
  • content-script-author
  • store-reviewer

Hooks

  • on-save: format
  • pre-commit: validate manifest

Rules

  • Request the narrowest permissions that work
  • No remote code, bundle everything
  • Test the service worker cold-start path

Summary

Wires Cursor into the quirks of Manifest V3: service-worker lifecycles, content-script isolation and the permission model that trips up most first extensions. For developers who want a working, store-ready extension without reading the whole Chrome docs tree.

87.0 score

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