get_url_from_safari_tabs.js

Safari = Application('Safari');
Safari.includeStandardAdditions = true;
SystemEvents = Application('System Events')
SystemEvents.includeStandardAdditions = true;
activeAppName = SystemEvents.processes.whose({frontmost:true}).at(0).name();
activeApp = Application(activeAppName);

function run(){
	frontWindow = Safari.windows.at(0);
	SystemEvents.activate()
	
	chooseName = SystemEvents.chooseFromList(
		frontWindow.tabs().map(function(t){return t.name()}), 
		{
			withTitle: 'Safari Tabs',
			emptySelectionAllowed: false
		}
	)
	tabName = chooseName.length ? chooseName[0] : frontWindow.tabs.whose({visible: true}).at(0).name();
	
	while (!activeApp.frontmost()){
		activeApp.activate();
	}
	return frontWindow.tabs.whose({name: tabName}).at(0).url()
}