Examine source code of TradingView Symbol Copier

{
  "manifest_version": 3,
  "name": "TradingView Symbol Copier",
  "version": "1.0.1",
  "description": "Copy visible TradingView symbols as a comma-separated list.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://*.tradingview.com/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tradingview-symbol-copier@tradeyantra.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Copy Symbols"
  },
  "commands": {
    "copy-symbols": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "Copy visible TradingView symbols"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.tradingview.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}