The script panel tries to show you all the scripts that have been compiled by Firefox's JS engine. Usually the script has a URL associated with it, which is what Firebug displays in the list of scripts, but sometimes, JavaScript gets compiled because of an event handler attribute, or an eval statement. In these cases, Firebug doesn't know the URL so it makes up a URL to display in the script list of the format <original_url>/<compilation_type>/seq/n
So an event handler script might look like index.html/event/seq/1 and an eval script look like index.html/eval/seq/2
Mike