Examine source code of GMail Notifier

{
  "description": "Checks GMail account using atom feed",
  "manifest_version": 2,
  "name": "Gmail Notifier",
  "version": "1.1.2resigned1",
  "background": {
    "scripts": [
      "background.js",
      "contextMenu.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/gmail-64.png",
    "default_title": "Gmail Notifier",
    "browser_style": false
  },
  "permissions": [
    "alarms",
    "*://mail.google.com/mail/*",
    "tabs",
    "contextMenus"
  ],
  "web_accessible_resources": [
    "icons/gmail-64.png",
    "icons/gmail-64-unread.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0df2d9d4-7eea-4db6-b637-add55cdd422f}"
    }
  }
}