How do I install an extension that I created?

I created an extension using this tutorial (http://blog.mozilla.com/addons/2009/01/28/how-to-develop-a-firefox-extension/), as well as other sources.
Error text:
''Firefox could not install this item because "install-48j..rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.''
Note that the three characters between the dash and the 2 dots changes every time I try an install. I tried installing it on 2 different versions of FF on Windows.
Extension:
http://dl.dropbox.com/u/5989060/remembertabs.xpi

You may also want to check out this line in rememberTabs.js:
<pre><nowiki>if (remember = true) -> if (remember == true)</nowiki></pre>
<pre><nowiki><!DOCTYPE remembertabs SYSTEM "chrome://remembertabs/locale/translations.dtd">
</nowiki></pre>
Try this instead:
<pre><nowiki><!DOCTYPE overlay SYSTEM "chrome://remembertabs/locale/translations.dtd">
<overlay id="remembertabs-overlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
</nowiki></pre>
Another forum that you can try is the mozillaZine Extension Development forum.
* http://forums.mozillazine.org/viewforum.php?f=19
You need to register on the MozillaZine Forums to post there

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