Userscripts.org

There are 2 previous versions of this script.

// ==UserScript==
// @name           Remove the Facebook Connect Plugin's "Like" iFrame
// @namespace      http://iss.oy.ne.ro/
// @description    Removes iframes created by Facebook Connect from all non-facebook sites - enough with that already!
// @include        http://*
// @exclude        http://www.facebook.com/*
// @exclude        http://mail.google.com/*
// @exclude        https://mail.google.com/*
// ==/UserScript==

// Delete the Facebook object (if it was already created)
unsafeWindow.FB = new Object();

// Delete all script blocks hosted on the Facebook site
// Source: http://www.briandonovan.info/articles/public/gm-dom-xpath-01/
var xpathResult = document.evaluate('//script[starts-with(@src, "http://connect.facebook.net")]', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for (var i=0; i<xpathResult.snapshotLength; i++) {
    var nodeToDelete = xpathResult.snapshotItem(i);
    nodeToDelete.parentNode.removeChild(nodeToDelete);
}

// Delete all iframes hosted on the Facebook site
var xpathResult = document.evaluate('//iframe[starts-with(@src, "http://www.facebook.com/")]', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for (var i=0; i<xpathResult.snapshotLength; i++) {
    var nodeToDelete = xpathResult.snapshotItem(i);
    nodeToDelete.parentNode.removeChild(nodeToDelete);
}