Content React

Shows a small overlay UI on every web page, with a React options page that moves it from right to left.

Runs on Chrome, Edge, Firefox · Manifest V3 · Surfaces: content script, options page, background service worker · Styling: CSS · Level: beginner · Framework: react

Create this project

npx extension@latest create my-content-react --template content-react
cd my-content-react
npm install
npm run dev

What it is for

  • A React UI injected into any page, isolated in a Shadow DOM
  • One setting shared between a React options page and a content script
  • Starting point for content-script extensions that need preferences

First steps

  • Run npm run dev to launch the extension
  • Click Open options on the overlay injected into the page
  • Tick the setting and watch the overlay move to the left edge

Permissions it asks for

  • storage

Source on GitHubDocumentation

extension.devDocumentation for extension.dev