Examine source code of Chromazon

{
  "name": "Chromazon",
  "version": "1.4resigned1",
  "manifest_version": 2,
  "description": "Get all amazon's europeans stores prices on one page !",
  "content_scripts": [
    {
      "matches": [
        "https://*.amazon.fr/*",
        "https://*.amazon.de/*",
        "https://*.amazon.it/*",
        "https://*.amazon.co.uk/*",
        "https://*.amazon.es/*"
      ],
      "js": [
        "base.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "https://webservices.amazon.fr/*",
    "https://*.amazon.fr/*",
    "https://*.amazon.de/*",
    "https://*.amazon.it/*",
    "https://*.amazon.co.uk/*",
    "https://*.amazon.es/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ecbe581-511b-447e-82f9-049b42d14887}"
    }
  }
}