Manifest

Permission Examples

{
  "name": "Slingshow",
  "version": "0.1.0",
  "description": "Easily request and create screen videos",
  "manifest_version": 2,

  "permissions": [
    "storage",
    "identity",
    "identity.email",
    "https://sigma-fonts.s3-us-west-1.amazonaws.com/",
    "https://www.slingshow.com/",
    "http://localhost:3001/"
  ],
  "options_page": "options.html",

  "background": {
    "scripts": ["build/background.js"]
    "type": "module"
    //type module means import as ES module, remove line so regular script
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon16.png",
    "24": "icon24.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "oauth2": {
    "client_id": "575235335697-ak2b2kc8pm1j8gc9r3484h9p1thju141.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.profile",
      "https://www.googleapis.com/auth/userinfo.email"
    ]
  },
  "homepage_url": "https://www.slingshow.com",
  "web_accessible_resources": ["img/*", "fonts/*"],
  "key": "[]"
}

Then go to chrome://extensions and click load unpacked extensions and click the folder of your code.

Boom, chrome extension. Click reload on changes.

Use React/Import/ES6 in Plugins

Use a bundler like webpack or parcel and output a single js file that you include as the script in some build folder

{
  "name": "chrome-base",
  "version": "0.1.0",
  "description": "Make web social again",
  "main": "scripts/scripts/js/main.js",
  "scripts": {
    "build:content": "parcel build scripts/content/content.js -d dist/build/ -o content.js",
    "watch:content": "parcel watch --no-hmr scripts/content/content.js -d dist/build/ -o content.js",
    "build:background": "parcel build scripts/background/background.js -d dist/build/ -o background.js",
    "watch:background": "parcel watch --no-hmr scripts/background/background.js -d dist/build/ -o background.js",
    "build": "concurrently \"npm run build:content\" \"npm run build:background\"",
    "watch": "concurrently \"npm run watch:content\" \"npm run watch:background\"",
    "clean": "rm -rf node_modules && rm package-lock.json"
  },
  "author": "Jorge Fuentes",
  "dependencies": {
    "@babel/runtime": "^7.5.5",
    "debug": "^4.1.1",
    "parcel-bundler": "^1.12.3",
    "react": "^16.8.6",
    "react-dom": "^16.8.6"
  },
  "devDependencies": {
    "@babel/core": "^7.6.2",
    "@babel/plugin-transform-runtime": "^7.6.2",
    "@babel/preset-env": "^7.6.2",
    "@babel/preset-react": "^7.0.0",
    "concurrently": "^4.1.0",
    "eslint": "^6.6.0",
    "eslint-config-prettier": "^6.5.0",
    "eslint-plugin-prettier": "^3.1.1",
    "eslint-plugin-react": "^7.16.0",
    "eslint-plugin-react-hooks": "^2.2.0",
    "prettier": "^1.18.2",
    "webextension-polyfill": "^0.5.0"
  }
}

Then change manifest.json to have the build scripts

Make sure all the files you want are imported in the one file you build

Content Security Policy

Not allowed to load external scripts in manifest V3

"content_security_policy": "script-src 'self' https://example.com; object-src 'self'"