Библиотека
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/451596/1095269/D%2A2.js
// ==Userscript==
// @name b2*2
// @description 2*2
// @version 1.0.0
// @license MIT
// @namespace Kaznacheev
// ==/Userscript==
function l (){
$('#double_your_btc_stake').val('#double_your_btc_stake').val()*2;
}