Examine source code of Teamspeak 3 Cube-Server

{
  "manifest_version": 3,
  "name": "Teamspeak 3 Cube-Server",
  "version": "0.2.0",
  "description": "Cube-Server Teamspeak3 Server Viewer",
  "action": {
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "images/cube-16.png",
    "32": "images/cube-32.png",
    "48": "images/cube-48.png",
    "128": "images/cube-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ts3_viewer@cube.net",
      "strict_min_version": "109.0"
    }
  }
}