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Gmail Domain Replacement - Switcher
// ==UserScript==
// @name Gmail Replace Domain
// @author http://codejoust.com
// @namespace http://mail.google.com/
// @description example script to alert "Hello world!" on every page
// @include http://mail.google.com/*
// ==/UserScript==
var your_domain = 'yourdomain.com'; //Your domain to change.
var canvas_frame = document.getElementById('canvas_frame').contentWindow.document; //The Canvas Frame in Gmail
var user_id = canvas_frame.getElementById('guser').getElementsByTagName('b')[0]; //Get the child b element containing username
user_id.innerHTML = user_id.innerHTML.replace('gmail.com',your_domain); //The actual replacement of the domain takes place here.
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