Examine source code of Gmail Notifier

{
  "name": "Gmail Notifier",
  "description": "__MSG_description__",
  "author": "Pankaj Aswal",
  "version": "1.1.0",
  "manifest_version": 2,
  "default_locale": "en",
  "permissions": [
    "notifications",
    "contextMenus",
    "webRequest",
    "storage",
    "alarms",
    "idle",
    "cookies",
    "*://mail.google.com/mail/",
    "*://mail.google.com/sync/"
  ],
  "background": {
    "scripts": [
      "/v2/chrome.tabs.query.js",
      "/v2/chrome.windows.create.js",
      "/v2/chrome.offscreen.js",
      "/v2/chrome.runtime.js",
      "/v2/chrome.contextMenus.create.js",
      "/v2/chrome.storage.session.js",
      "/v2/chrome.action.js",
      "/v2/chrome.alarms.get.js",
      "core/utils/log.js",
      "core/open.js",
      "core/offscreen.js",
      "core/context.js",
      "core/button.js",
      "core/sound.js",
      "core/check.js",
      "core/repeater.js",
      "core/watch.js",
      "worker.js",
      "core/utils/feed.js",
      "core/utils/sax.js"
    ]
  },
  "options_ui": {
    "page": "/data/options/index.html",
    "open_in_tab": true
  },
  "homepage_url": "http://pankajcitationnetwork.alchosting.xyz/",
  "icons": {
    "16": "/data/icons/red/16.png",
    "18": "/data/icons/red/18.png",
    "19": "/data/icons/red/19.png",
    "32": "/data/icons/red/32.png",
    "48": "/data/icons/red/48.png",
    "64": "/data/icons/red/64.png",
    "128": "/data/icons/red/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "/data/icons/blue/16.png",
      "18": "/data/icons/blue/18.png",
      "19": "/data/icons/blue/19.png",
      "32": "/data/icons/blue/32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pankaj-aswal@mailer"
    }
  }
}