Examine source code of Copy URL

{
  "manifest_version": 2,
  "name": "Copy URL",
  "version": "1.0",
  "description": "Copy the current page url to the clipboard",
  "icons": {
    "48": "icons/link_copy.svg",
    "96": "icons/link_copy.svg"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "page_action": {
    "default_icon": "icons/link_copy.svg",
    "default_title": "Copy URL",
    "show_matches": [
      "*://*/*"
    ]
  },
  "background": {
    "scripts": [
      "copied.js"
    ]
  }
}