disable javascript:alert() on firefox?

[Carlos Silva]

   Hi all,
   Someone know how to disable the [1]javascript:alert() function?
   Because it's anoying when you enter a page and have a lots of SPAM
   from that Sad .
Best Regards,

Carlos Silva, CSilva
Web: [2]http://www.csilva.org/

References

   1. javascript:alert(
   2. http://www.csilva.org/