Examine source code of PriceBlink

{
  "manifest_version": 2,
  "name": "PriceBlink",
  "version": "1.0",
  "description": "Automatically find lower prices and coupon codes while shopping online.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{436b530d-e646-40b1-b1c0-9a07214f9c65}"
    }
  }
}