Examine source code of Copy Current URLc

{
  "manifest_version": 2,
  "name": "Copy Current URL",
  "version": "1.0",
  "description": "Quickly copies the current tab URL to the clipboard.",
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee808dc7-3601-412c-a3b5-39a8eb853f22}"
    }
  }
}