Access a variable on a Site tab from within a Page

Thanks Yisrael / Brewmaster. How do I retrieve the url from storage?

When I update the page code to what you see below, the value inputted into field #input6 is the current webpage and not the previous one.

import wixData from 'wix-data';
import wixLocation from 'wix-location'; 
import {local, session, memory} from 'wix-storage';


$w.onReady(function() {
   let previousPageURL = session.getItem("page");
   $w("#input6").value = previousPageURL;
});