Examine source code of create-react-ext

{
  "author": "French Tech Tips & Hokanosekai",
  "manifest_version": 2,
  "name": "ReactExtension",
  "short_name": "ReactExtension",
  "version": "1.0.0",
  "description": "React & Redux & Tailwind bundle Web Extension Template",
  "icons": {
    "192": "./logo192.png",
    "512": "./logo512.png"
  },
  "web_accessible_resources": [
    "popup.html"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*"
      ],
      "js": [
        "./js/browser-polyfill.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./js/browser-polyfill.js",
      "./js/vendor.js",
      "./js/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "nativeMessaging",
    "notifications",
    "storage",
    "tabs",
    "webNavigation",
    "https://*/*",
    "http://*/*"
  ],
  "browser_action": {
    "default_icon": "./logo192.png",
    "default_title": "ReactExtension",
    "default_popup": "./popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "create-react-extension@HFTT.app"
    }
  }
}