[Fixefox GreaseMonkey Plugin Script] Fix Old Asset Store Links

gistfile1.js

// ==UserScript==
// @name     Fix Old Asset Store Links
// @version  1
// @include  https://www.assetstore.unity3d.com/*
// @grant    none
// ==/UserScript==

// get current url
var URL = window.location.href;

// parse package id after last "/"
var id = URL.match(/(?!\/)(?:.(?!\/))+$/);

// get new link
var newURL = "https://assetstore.unity.com/packages/slug/"+id;
                 
// Create anchor element
var a = document.createElement('a');  

// Create the text node for anchor element
var link = document.createTextNode(newURL); 

// Append the text node to anchor element
a.appendChild(link);  

// Set the title
a.title = newURL;  

// Set the href property
a.href = newURL;  

// Append the anchor element to the body
document.body.appendChild(a);