Examine source code of NTS Plus

{
  "manifest_version": 3,
  "name": "NTS Plus",
  "version": "0.7",
  "description": "Enhancements for NTS radio.",
  "icons": {
    "128": "ntsplus128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.nts.live/*"
      ],
      "js": [
        "content_scripts/nts.js"
      ]
    },
    {
      "matches": [
        "https://player-widget.mixcloud.com/*"
      ],
      "js": [
        "content_scripts/mixcloud.js"
      ],
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup/popup/popup.html"
  },
  "background": {
    "service_worker": "background/background.js",
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "identity",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ntsplusextension@gmail.com",
      "strict_min_version": "136.0"
    }
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq7Rnvc4jMr9PQbjloe/I8GliYLpr8VP6njbbIONvgW5PLPTe2kE0eZ22wUbj9g95wIeVqliI/8ti586iNeb/pV61yLX5cuEqN3ugnu/Ctz6/1b96Qu4UwJH/SPsGm90E+Qa5vJqNwWbPmKBkXPZOw7eDRwGNLbsDmSTz1iXR73Ba0Nu4FxLuIAGlBasmwxeVH1+RTYmGv2pDtRqOQkojlQ7w3uQ45ER1cPZjNDFRx0sXv8B+5e+RnwLCVV8Kbn9sX9weYN+EyX/7hQ/bpP0STYrVZMMTH7qpwVi/B2DPpOR5aZkuh+80+fgJi8yf7uKp7eUUh8VGvLbdu6Ia5vJRAwIDAQAB"
}