Years ago, Chris Smith made a couple of bookmarklets to easily grab a site's UUID and another one for its Alias.
From Wikipedia:
Whenever I need to get a widget's content-uuid, I have to right-click on the widget, choose "inspect" or "inspect element" then scroll through the developer tools to spot the content uuid. Which is the unique ID for that particular widget. So I thought I'd take a look at Chris' code and see if I can adapt it:
javascript:$(".os_core:first").one("clic