Examine source code of F-Notifier

{
  "name": "__MSG_extName__",
  "version": "2.8.5",
  "description": "__MSG_extDescription__",
  "homepage_url": "https://dev.ligny.org/F-Notifier",
  "author": "Arnaud Ligny",
  "manifest_version": 2,
  "minimum_chrome_version": "52",
  "default_locale": "en",
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "alarms",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "https://m.facebook.com/"
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "38": "icon-38.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false,
    "chrome_style": true,
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3b5da596-9072-4e68-bce5-adb82ac9063a}"
    }
  }
}