Examine source code of Discount Tracker Plus

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.0",
  "background": {
    "scripts": [
      "popup.js"
    ]
  },
  "permissions": [
    "tabs",
    "http://*/",
    "https://*/",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "logo.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff491921-0450-4f50-a1e7-bf1913fe33fa}"
    }
  }
}