New User Script > paste from keyboard > save

    // ==UserScript==
    // @run-at document-start
    // @name        Bing to Duck
    // @namespace   jethack
    // @description This practically stolen userscript redirects Bing searches to DuckDuckGo.
    // @include     http://*.bing.com/search?*
    // @include     https://*.bing.com/search?*
    // @version     1
    // @grant       none
    // ==/UserScript==

    var newurl = "https://duckduckgo.com/?"+document.URL.match(/q\=[^&]*/);
    if (newurl != document.URL) location.replace(newurl);