Examine source code of Rajiko

{
  "manifest_version": 3,
  "name": "Rajiko",
  "version": "3.2026.3",
  "description": "__MSG_manifest_app_description__",
  "icons": {
    "48": "Circle-icons-radio-blue-48.png",
    "128": "Circle-icons-radio.png"
  },
  "permissions": [
    "activeTab",
    "cookies",
    "storage",
    "webRequest",
    "downloads",
    "unlimitedStorage",
    "declarativeNetRequest",
    "scripting",
    "webRequestBlocking",
    "webRequestFilterResponse"
  ],
  "host_permissions": [
    "*://*.radiko.jp/*",
    "*://*.smartstream.ne.jp/*",
    "*://*.radiko-cf.com/*"
  ],
  "optional_host_permissions": [
    "*://*.nhk.jp/*",
    "*://*.nhk.or.jp/*",
    "*://*.tver.jp/*",
    "*://*.recochoku.jp/*"
  ],
  "default_locale": "ja",
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.radiko.jp/"
      ],
      "js": [
        "ui/common_start.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.radiko.jp/share/?*noreload=1*"
      ],
      "js": [
        "ui/share_redirect.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "ui/inspect_start.js",
        "ui/share_redirect_inject.js"
      ],
      "matches": [
        "*://*.radiko.jp/*"
      ]
    },
    {
      "resources": [
        "response/*.html"
      ],
      "matches": [
        "*://*.radiko.jp/*"
      ]
    }
  ],
  "action": {
    "default_icon": "Circle-icons-radio-blue-48.png",
    "default_popup": "pages/popup.html",
    "default_title": "__MSG_popup_title__"
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a8c3e6f-40c7-4eeb-9e42-8d7a803af62b}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}