Examine source code of Copy Current URL

{
  "manifest_version": 3,
  "name": "Copy Current URL",
  "version": "1.0",
  "description": "Copies the current tab URL using Cmd + Shift + C",
  "permissions": [
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "copy-current-url@vito.io"
    }
  }
}