Examine source code of Worldtime

{
  "manifest_version": 2,
  "name": "Worldtime",
  "description": "All time zones in one click",
  "version": "1.2.32resigned1",
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "icons/icon_19.png",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "contextMenus",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3871e381-66e9-4268-b45a-56fc8ff263c0}"
    }
  }
}