Examine source code of Superjour

{
  "name": "Superjour",
  "description": "Votre liste de cadeaux avec Superjour. Cliquez sur l'extension depuis n'importe quel site présentant un produit qui vous intéresse.",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlMGLyo5Ckpmw/LBFjGGCum4DuvX8v6hPy2nd+pUbrqLPL5ZRMwAFBmxu2Pbaq+DOQpqXuEpCqHtQSiQP0Hd7QXfzrLiZ0dOv9hljnoovPwTZbEvZaRudpoKFGGxUL+ZkXWB5QIxdm7g3Y6mg+53Kfe3UTQ5lXXm3Y9YTgHfYqq+KcGcq4JPMFJ7erngmn7n5O8dbkq6fpGKG6ozkElmmynLzb+XiBYRQA5BfxEzMIYJcXRPYtsAQRGEwE9u7QMXcaUmlqZ+mTvKW/7plsLPmO85DxS/2c+GRs7Nd6b+PHv08jy9KfCBswRB9W9tuF8461hUQ0t39wDdEgf91j//1GwIDAQAB",
  "version": "1.0.4",
  "manifest_version": 2,
  "icons": {
    "16": "ico/16x16.png",
    "48": "ico/48x48.png",
    "128": "ico/128x128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "vendor/browser-polyfill.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "vendor/jsrsasign-all-min.js",
      "vendor/browser-polyfill.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d14991c8-5ebd-4f3e-ab0a-8031752b9481}"
    }
  }
}