Style Sheet Parser Plugin: Uncaught Exception in Firefox

Can anyone confirm whether or not they're able to use the style sheet parser in Firefox 8? If I can get confirmation that someone else is using the plugin without a problem, that might be a confirmation that there's a conflict in my code between the style sheet parser plugin and something else.

Kind regards,
Raymond

http://nightly.ckeditor.com/latest/cked ... arser.htmlhttp://dev.ckeditor.com/ticket/8660