I am glad that had solved your problem.
I'd like to ask you to open the new questions as a new ticket in the future, because otherwise the ticket response time keeps passing though the original issue has been resolved. Following this practice will ensure that all clients get prompt and high quality assistance. Thank you for your understanding.
Now, to your second question. SiteMenu is using RadMenu component (you can find out more about it here
), which supports all the major browsers (http://www.telerik.com/products/aspnet-ajax/resources/browser-support.aspx
). As a matter of fact most of the staff here in Telerik is using Firefox as their browser of choice and we have not experienced any problems.
The most probable cause of your problems is the custom CSS which can interfere with the menu. I suggest you try out the menu with a default template that comes with Sitefinity and one of the built-in themes. In case you experience problems there, please do let us know - and preferably send us some screenshots. If everything is working as expected, then problem is most probably with your custom CSS. You can use FireBug in Firefox to locate the problem.
I hope you will find this information helpful. Let us know if there is anything else we can do for you.
the Telerik team