Examine source code of Quick URL Copy

{
  "manifest_version": 2,
  "name": "Quick URL Copy",
  "version": "0.1.0",
  "description": "Quickly add the current URL to your clipboard",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "commands": {
    "copy_current_url": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "Command+Shift+L"
      },
      "description": "Add the current tab's URL to your clipboard"
    }
  },
  "background": {
    "scripts": [
      "quick-url-copy.js"
    ]
  },
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1cecc2e3-8c3a-4d14-9f75-2d9ffd8bb01c}"
    }
  }
}