Examine source code of FanAlert

{
  "manifest_version": 2,
  "name": "FanAlert",
  "version": "1.0.0",
  "description": "Get alerts for sports highlights from your favorite teams, right in your browser.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "identity"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@data-collection-settings",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}