There are 12 previous versions of this script.
// ==UserScript==
// @name Very New Yahoo Mail Beta, Yahoo Mail & Classic Ad, Footer & Sidepan Removal
// @namespace http://www.devsol.co.nr/
// @description removes the ads last updated 19-01-2011
// @include http://*.mail.yahoo.com/neo/*
// @include http://*.mail.yahoo.com/mc/welcome?*
// @include http://*.mail.yahoo.com/ym/login*
// @include http://*.mail.yahoo.com/ym/ShowFolder*
// @include http://*.mail.yahoo.com/ym/ShowLetter*
// @include http://*.mail.yahoo.com/ym/Compose*
// @include http://*.mail.yahoo.com/dc/launch*
// @include http://*.mail.yahoo.com/ym/Folders*
// @include http://*.mg.mail.yahoo.com/*
// ==/UserScript==
GM_addStyle("iframe#emptyFolderFrame{ visibility:hidden;display:none; }");
GM_addStyle("embed { visibility:hidden;display:none; }");
GM_addStyle("div#nwad { visibility:hidden;display:none; }");
GM_addStyle("div#swads { visibility:hidden;display:none; }");
GM_addStyle("iframe#N { visibility:hidden;display:none; }");
GM_addStyle("div#theAd 2 { visibility:hidden;display:none; }"); // removes right ads //Beta 2
GM_addStyle("div#theAd { visibility:hidden;display:none; }"); // removes right ads // Beta 2
GM_addStyle("div#slot_LREC { visibility:hidden;display:none; }"); // removes main pan ads // Beta 2
GM_addStyle("div#upsell { visibility:hidden;display:none; }"); // removes main pan ads // Beta 2
GM_addStyle("div#gx_top_searches { visibility:hidden;display:none; }"); // removes Trending Now from What's New(Y! New Existing)
GM_addStyle("div#slot_MIP4 { visibility:hidden;display:none; }"); // removes ad in from What's New (bellow Trending Now, Y! New Existing)
GM_addStyle("div#mg_slot_LREC { visibility:hidden;display:none; }"); // removes right ads
GM_addStyle("div#MNW { visibility:hidden;display:none; }"); // removes left ads above 'Folders'
GM_addStyle("iframe#REC { visibility:hidden;display:none; }"); // removes left ads bellow 'My Folders'
GM_addStyle("div#mg_footer { visibility:hidden;display:none; }"); // removes footer copyright, TOS text
GM_addStyle("div#northbanner { visibility:hidden;display:none; }"); // removes top ads slot (Y! Mail Classic)
GM_addStyle("div#MIP4 { visibility:hidden;display:none; }"); // removes right ads (Y! Mail Classic)
// finally increasing width of msg list
var bod = document.getElementsByTagName('body')[0]; var ymStyle = document.createElement("style");
ymStyle.innerHTML = "#paneshell #shellcontent{right:0px !important;},.nav-bar div.tabs {padding-left:0px !important;}#paneshell #shellnavigation";
bod.insertBefore(ymStyle, bod.firstChild);