Examine source code of CB Friend

{
  "manifest_version": 2,
  "name": "CB Friend",
  "version": "1.13",
  "description": "A little helper for the coinbase service that simplifies some routine actions.",
  "icons": {
    "48": "icons/cb-48.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "cookies",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/cb-48.png",
    "default_title": "CB Friend",
    "default_popup": "popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42e17c50-d853-4a4a-bc2c-edd0e527069c}"
    }
  }
}