Examine source code of Copy TabURL as Text

{
  "author": "igorlogius",
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+C"
      }
    }
  },
  "description": "Copy active tab url via pageAction or shortcut",
  "icons": {
    "128": "icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "name": "Copy Tab URL as Text",
  "page_action": {
    "browser_style": true,
    "show_matches": [
      "<all_urls>"
    ],
    "default_popup": "popup.html",
    "default_icon": "icon.svg"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "version": "1.2.10",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b3cbc90-4e8a-4877-b0e8-eecf42b4d604}"
    }
  }
}