Examine source code of Everything Dark

{
  "manifest_version": 3,
  "name": "Everything Dark",
  "version": "0.1.0",
  "description": "Adaptive dark mode for arbitrary websites with per-site controls.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "service_worker": "background/index.js"
  },
  "action": {
    "default_title": "Everything Dark",
    "default_popup": "popup/index.html"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/bootstrap.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "everything-dark@example.local"
    }
  }
}