set a URL-shorten button at the bottom left corner. It will create a new window for the shortened URL of cutt.ly.
As of
// ==UserScript==
// @name cutt.ly URL shorten button
// @name:zh-TW cutt.ly 縮短網址按鈕
// @name:zh-CN cutt.ly 缩短网址按钮
// @description set a URL-shorten button at the bottom left corner. It will create a new window for the shortened URL of cutt.ly.
// @description:zh-TW 在頁面左下角設置一個縮短網址的按鈕，這會開個新視窗來檢視 cutt.ly 的縮址結果
// @description:zh-CN 在页面左下角设置一个缩短网址的按钮，这会开个新视窗来检视 cutt.ly 的缩址结果
// @namespace https://greasyfork.org/zh-TW/users/393133-evan-tseng
// @version 0.1
// @author Evan Tseng
// @include *://*
// @exclude *://cutt.ly/*
// @grant none
// ==/UserScript==
(async function() {
'use strict';
const CuttURL = 'https://cutt.ly/?shortenit='+encodeURIComponent(location.href);
let strWindowFeatures = 'width=500, height=874, menubar=no, location=yes, resizable=no, status=no';
var shortenWrap = null,
shortenButton = null;
const css = '.__shorten_wrap__ {position: fixed; bottom:20mm; left:-33px; z-index:2147483647}'+
'.__shorten_url__ {font: 400 11pt sans-serif; color:#555; background:#eee; padding: 1mm 2mm 2mm; margin:0; line-height:1.1; border:1px solid #555; border-radius:5px; cursor:pointer; transform:rotate(90deg)}'+
'.__shorten_url__:hover {color:#448; background:#fff; box-shadow:0 0 2mm rgba(0,0,0,.5)}'+
'.__shorten_url__:active {color:#333; background:#eee; box-shadow:inset 0 0 5px rgba(0,0,0,.5)}',
cssStyle = document.createElement('style');
if(cssStyle.styleSheet) cssStyle.styleSheet.cssText = css;
else cssStyle.appendChild(document.createTextNode(css));
document.querySelector('head').appendChild(cssStyle);
shortenWrap = document.createElement('div');
shortenWrap.setAttribute("class", "__shorten_wrap__");
document.body.appendChild(shortenWrap);
shortenButton = document.createElement('button');
shortenButton.setAttribute("class", "__shorten_url__");
shortenButton.innerText="Cutt URL";
shortenWrap.appendChild(shortenButton);
shortenButton.addEventListener("click", function(){
window.open(CuttURL, "Cuttly URL", strWindowFeatures);
});
})();