Just press Ctrl+Alt+Shift+Q on any page to see QR-code.
Per
// ==UserScript==
// @name QR Code
// @icon http://qrcoder.ru/sys/inc/des/qr-code-2d-bar-mobile-code-qrcoder.gif
// @namespace x4_qrc
// @version 0.1
// @description Just press Ctrl+Alt+Shift+Q on any page to see QR-code.
// @author x4fab
// @match *://*/*
// @license CC0
// @grant none
// ==/UserScript==
/*
boormark version:
javascript:document.body.insertAdjacentHTML('beforeend','<div style="z-index:9999999999;background:center no-repeat rgba(0,0,0,.7);position:fixed;top:0;bottom:0;left:0;right:0;opacity:0;background-image:url(data:image/gif;base64,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);transition:0.3s" onclick="this.style.opacity=0;setTimeout(this.removeChild.bind(this.parentNode,this),300)"><span style="position:fixed;display:block;top:0;left:0;bottom:0;right:0;background:center no-repeat url(https://api.qrserver.com/v1/create-qr-code/?data='+encodeURIComponent(location)+'&size=400x400&margin=20)"></span></div>');setTimeout(function(){this.style.opacity=1}.bind([].pop.call(document.querySelectorAll('div'))),0)
*/
window.addEventListener('keydown', function (e){
if (e.keyCode == 81){
document.body.insertAdjacentHTML('beforeend', '<div style="z-index:9999999999;background:center no-repeat rgba(0,0,0,.7);position:fixed;top:0;bottom:0;left:0;right:0;opacity:0;background-image:url(data:image/gif;base64,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);transition:0.3s" onclick="this.style.opacity=0;setTimeout(this.removeChild.bind(this.parentNode,this),300)"><span style="position:fixed;display:block;top:0;left:0;bottom:0;right:0;background:center no-repeat url(https://api.qrserver.com/v1/create-qr-code/?data='+encodeURIComponent(location)+'&size=400x400&margin=20)"></span></div>');
setTimeout(function(){this.style.opacity=1}.bind([].pop.call(document.querySelectorAll('div'))),0);
}
}, false);