Examine source code of Dark Comfort Mode

{
  "manifest_version": 3,
  "name": "Dark Comfort Mode",
  "version": "1.0.0",
  "description": "Dark mode with real-time date, time and week number",
  "browser_specific_settings": {
    "gecko": {
      "id": "dark-comfort-mode@networkluki.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "id": "dark-comfort-mode-android@networkluki.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Dark Comfort Mode"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}