Error in Firefox mac

Error in Firefox mac

<br clear="all">Hi,
I have created  plugin that extends the jQuery.browser extension, but it is not working only on firefox mac(in safari it is ok), not executing the plugin as it should.(it doesn't detect any of the browser plugins)
Could this be a browser bug, or an i missing something?
Here is the plugin demo page:<a href="http://jqplugins.appspot.com/jqplugin">http://jqplugins.appspot.com/jqplugin</a>
Thanks
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Leonardo Rosseti, Web Developer / Desenvolvedor Web
Profile / Perfil: <a href="http://www.linkedin.com/in/leoros">http://www.linkedin.com/in/leoros</a>