Examine source code of Email Spy

{
  "name": "Email Spy",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "browser_style": false,
    "default_title": "Email Spy",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "https://duckduckgo.com/*"
  ],
  "description": "Find all available email contacts for a domain with a single click.",
  "version": "0.0.4resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0cc7cf7e-a5f5-4d46-800a-e9db954118b6}"
    }
  }
}