JSP TagLib

Hi i am working with FCK on my jsp pages, i successfuly added the taglib and it's working fine, now I am trying to customize it, i edit my fckconfig.js to add a custom toolbar "MyToolbar" like from the sample, but this have a problem on mozilla, on internet explorer works fine, while on firefox seems that the configuration file is not visible, because any change made to it, hasn't got any consequence.
On this firefox alert with Toolbar Name "MyToolbar" is not defined..

thanks in advance