Examine source code of WriterAccess Mail Check

{
  "background": {
    "persistent": false,
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "img/icon.png"
  },
  "description": "This extension periodically checks your account for new messages, and provides single-click access to your account mailbox",
  "name": "WriterAccess",
  "permissions": [
    "alarms",
    "tabs",
    "activeTab",
    "webNavigation",
    "*://*.writeraccess.com/",
    "contextMenus",
    "storage",
    "background"
  ],
  "version": "1.0.2resigned1",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{543a9b14-83c7-46d2-8cfe-f2861d4170c0}"
    }
  }
}