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    <p>First the correct answer, which isn't really what you're looking for, but to important to omit:</p> <p><strong>Do not append/inject/whatever remotely retrieved HTML or javascript code into XUL or chrome code scopes!</strong></p> <p>Stuff like this always is a security vulnerability. JS is executable, and HTML may contain executable bits as well (e.g. javascript: protocol). Any injected code will run with full browser privileges, which translates to OS user privileges (which on Windows XP translates to Administrator privileges).</p> <p>You need to either escape the html, or parse it and only leave secure bits in.</p> <p>You cannot trust remote code, even if it originates from your own servers:</p> <ul> <li>Man in the middle attacks (http)</li> <li>Compromised server</li> <li>Rough server admin (not you, hopefully ;))</li> </ul> <p>BTW: Appending/injecting/whatever remotely retrieved code or HTML into chrome space will lead to rejection of the affected versions of your add-on on addons.mozilla.org for the reason stated above.</p> <p>Now the technically correct answer, but do not use with remotely retrieved and sanitized HTML:</p> <ol> <li>You need to make sure the correct HTML namespace will be used (<code>xmlns:html="http://www.w3.org/1999/xhtml"</code>)</li> <li>You cannot actually <code>appendElement()</code> text, but only real DOM elements. Hence you must parse any text into a DOM before. Easiest with valid XML (<a href="https://developer.mozilla.org/en/DOMParser" rel="nofollow">DOMParser</a>); possible for tag soup stuff via a hidden iframe.</li> <li>You should <code>adoptNode</code> any Elements from different DOMs</li> <li>Append the elements one by one then (each menuitem and subtree).</li> </ol>
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    1. POAppending HTML to XUL (Firefox extension)
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    1. COThe problem is that the rss feed contains a html part which is hard to parse into individual elements using javascript (it's a PITA). So I'm looking for a simpler way to append it.
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