JS to use Amazon-Smile

amazon-smile.user.js

// ==UserScript==
// @id             force-smile@smeagol
// @name           Amazon plugin to use smile
// @category       Tweaks
// @version        1.0.0.20180103.162525
// @namespace      https://github.com/smeagol91
// @updateURL      https://gist.githubusercontent.com/smeagol91/354783821d737fa726423369d195a8f0/raw
// @downloadURL    https://gist.githubusercontent.com/smeagol91/354783821d737fa726423369d195a8f0/raw
// @description    Force usage of smile.amazon.* instead of a none smile url
// @include        https://*.amazon.de/*
// @include        http://*.amazon.de/*
// @match          https://*.amazon.de/*
// @match          https://*.amazon.de/*
// @grant          none
// ==/UserScript==


if(window.location.href.indexOf('smile') === -1) {
  var redir = window.location.href
                 .replace(/^http:/, 'https:')
                 .replace(/\/www\./, '/smile.');
  if(redir != window.location.href) {
    // only redirect if there is any change
    window.location = redir;
    throw('Need to load amazon smile version.');
  }
}