Examine source code of CSS & HTML Exporter

{
  "manifest_version": 2,
  "name": "CSS & HTML Exporter",
  "version": "1.0",
  "description": "Выбор элементов и копирование HTML/CSS",
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "CSS & HTML Exporter",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    },
    "default_panel": "sidebar.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02cd3959-0150-4869-a051-cca79a2b8480}"
    }
  }
}