Greasy Fork is available in English.
Install this script on a friend's computer, hide their Greasemonkey icon and look at their faces.
//
// Written by Glenn Wiking
// Script Version: 0.0.1b
//
// ==UserScript==
// @name ShadeRoot Prank
// @namespace SRPRANK
// @version 0.0.1b
// @grant none
// @icon //
// @description Install this script on a friend's computer, hide their Greasemonkey icon and look at their faces.
// @include *
// ==/UserScript==
function ShadeRootPrank(css) {
var head, style;
head = document.getElementsByTagName('head')[0];
if (!head) { return; }
style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = css;
head.appendChild(style);
}
ShadeRootPrank(
'html, body {filter: grayscale(100%) blur(.5px) !important; opacity: .95;}'
+
'* a, * button, * li {filter: blur(0) !important; transition: filter 200ms ease-in-out 0ms !important;}'
+
'* a:hover, * button:hover, * li:hover {filter: blur(.5px) !important; transition: filter 200ms ease-in-out 0ms !important;}'
);