Examine source code of EasyFutWeb

{
  "name": "EasyFutWeb",
  "version": "3.2",
  "description": "A extensão necessária para a utilização automatizada do EasyFutWeb. User com moderação conforme as orientações de segurança.",
  "manifest_version": 2,
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webNavigation",
    "webRequestBlocking",
    "activeTab",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "applications": {
    "gecko": {
      "id": "easyfutweb@gmail.com",
      "strict_min_version": "55.0"
    }
  },
  "background": {
    "page": "index.html"
  },
  "browser_action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js",
        "jquery.js",
        "bil.js",
        "sd.js"
      ],
      "matches": [
        "*://www.ea.com/*/ultimate-team/web-app/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "content2.js"
      ],
      "matches": [
        "*://easyfutweb.herokuapp.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "content-fb.js"
      ],
      "matches": [
        "*://www.futbin.com/*"
      ],
      "run_at": "document_start"
    }
  ]
}