Examine source code of ForumHelper

{
  "manifest_version": 2,
  "name": "ForumHelper",
  "version": "1.3",
  "description": "Helper for administartions Arz-RP",
  "applications": {
    "gecko": {
      "id": "alexalavares@gmail.com",
      "strict_min_version": "48.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://forum.arizona-rp.com/*",
        "*://ulog.union-u.net/*",
        "*://arizonarp.logsparser.info/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ]
}