Examine source code of SoundCloud Enhanced Pro

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "3.1.0",
  "short_name": "SC Enhanced",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "*://*.soundcloud.com/*",
    "*://*.sndcdn.com/*",
    "*://*.soundcloud.cloud/*",
    "https://unifybrowse.com/*",
    "https://sd.unifybrowse.com/*"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Open SoundCloud Enhanced Pro"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://soundcloud.com https://*.soundcloud.com https://*.sndcdn.com https://*.soundcloud.cloud https://*.ingest.de.sentry.io https://unifybrowse.com https://sd.unifybrowse.com",
  "externally_connectable": {
    "matches": [
      "*://soundcloud.com/*"
    ]
  },
  "web_accessible_resources": [
    "content-scripts/*",
    "assets/icons/*"
  ],
  "minimum_chrome_version": "88",
  "browser_specific_settings": {
    "gecko": {
      "id": "soundcloud-enhanced-pro@theany.ir",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity",
          "personalCommunications",
          "personallyIdentifyingInfo",
          "websiteActivity",
          "websiteContent"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "SoundCloud Enhanced Pro",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.soundcloud.com/*",
        "*://soundcloud.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}