Examine source code of React Developer Tools CNC

{
  "manifest_version": 2,
  "name": "React Developer Tools",
  "version": "1.3",
  "description": "Inspect React apps, detect React version, and log top-level components.",
  "permissions": [
    "<all_urls>",
    "tabs",
    "activeTab"
  ],
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "devtools_page": "panel.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{fea84172-90d7-48f6-a7b6-58587fd6284b}"
    }
  }
}