Examine source code of Compare prices across

{
  "manifest_version": 2,
  "name": "InvisibleHand",
  "version": "1.0",
  "description": "Compare prices across online retailers instantly.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{09acce65-93aa-4c3b-86a8-e8fcc161306d}"
    }
  }
}