Examine source code of PmTrick

{
  "manifest_version": 2,
  "name": "PmTrick",
  "description": "Planetarium Manager online football manager game Browser Extension.",
  "version": "1.0.0",
  "browser_action": {
    "default_icon": "icon-16.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.pmanager.org/titulares_v3.asp*",
        "https://www.pmanager.org/procurar.asp?action=proc_jog*",
        "https://www.pmanager.org/plantel.asp*filtro=1*"
      ],
      "js": [
        "js/browser-polyfill.js",
        "js/contentscript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": "object-src 'self'; script-src 'self'",
  "web_accessible_resources": [
    "js/tacticEditor.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3bdc34cb-b6e6-4ea4-bb31-6e9e38e8d84c}",
      "strict_min_version": "55.0"
    }
  }
}