Examine source code of WarEra Diplomatic Mode

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "WarEra Diplomatic Mode",
  "version" : "1.0",
  "description" : "Add diplomacy mode on WarEra",
  "permissions" : [
    "storage" 
  ],
  "host_permissions" : [
    "https://app.warera.io/*" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "https://app.warera.io/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_end" 
    }
  ],
  "icons" : {
    "128" : "icon.png"
  }
}