Examine source code of Sinônimos

{
  "manifest_version": 2,
  "name": "Sinônimos",
  "version": "0.0.1",
  "author": "MCA",
  "description": "Facilita a sua buscar por sinônimos em páginas da web.",
  "icons": {
    "48": "icons/s-48.png",
    "96": "icons/s-96.png"
  },
  "background": {
    "scripts": [
      "menu.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "sinonimos.js"
      ]
    }
  ],
  "permissions": [
    "http://*/*",
    "https://*/*",
    "contextMenus",
    "storage",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{09d7df6a-ea40-4460-96a9-4a81dfc666d6}"
    }
  }
}