Examine source code of Simple Brightness Control

{
  "manifest_version": 2,
  "name": "Easy Dark Mode",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "easy-dark-mode@example.com"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+D"
      },
      "description": "Öffnet das Easy Dark Mode Popup"
    }
  }
}