// ==UserScript==
// @name           Unicorn
// @namespace      http://www.w3.org/1999/xhtml
// @description    Unicorns! Everywhere!
// @include        *
// ==/UserScript==

var textnodes, node, s;

textnodes = document.evaluate(
    "//text()",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null);
for (var i = 0; i < textnodes.snapshotLength; i++) {
    node = textnodes.snapshotItem(i);
    s = node.data;
    s = s.replace(/Tablette|tablet|ipad|islate/gi, "Unicorn");
    node.data = s;
}