Examine source code of Focus Mode Pro

{
  "name": "__MSG_appName__",
  "version": "1.2.0",
  "description": "__MSG_appDesc__",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "cfblocker/Filter.js",
      "cfblocker/ListFormatter.js",
      "cfblocker/LocalStorageStore.js",
      "cfblocker/UrlFormatter.js",
      "sites.js",
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "http://*/",
    "https://*/"
  ],
  "default_locale": "en",
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdc5599d-6228-41e3-92cb-da7c69793c17}"
    }
  }
}