Examine source code of CartShare

{
  "manifest_version": 2,
  "name": "CartShare",
  "version": "1.0",
  "description": "Share your Amazon shopping cart with anyone in seconds.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44df29cc-1398-4ded-bfb4-b78a76d12be1}"
    }
  }
}