Examine source code of Dark Mode Bang

{
  "manifest_version": 3,
  "name": "Dark Mode Bang - Universal Dark Theme",
  "version": "1.0.0",
  "description": "Transform any website into dark mode automagically",
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Dark Mode Bang"
  },
  "commands": {
    "toggle-dark-mode": {
      "suggested_key": {
        "default": "Ctrl+Shift+M"
      },
      "description": "Cycle through dark mode states"
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "darkmodebang@synthralabs.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}