Examine source code of Splitplan Extension

{
  "name": "Splitplan Extension",
  "version": "1.1resigned1",
  "description": "Extension for splitplan.com",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "http://api.splitdev.com:8888/*",
    "https://api.splitplan.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3b65c3e-9c93-4322-ae8b-62cf7279c83b}"
    }
  }
}