Java script koduna Mozilla'da çalıştırmayı nasıl ekleyebilirim?

<SCRIPT language=javascript>
//No Right Click Script
function NSclick(e) {
  if (navigator.appName=="Netscape" && parseInt(navigator.appVersion)==4) { 
    if (e.which == 3) {
      return false;
    }
  }
  if (navigator.appName=="Netscape" && parseInt(navigator.appVersion)>=5) { 
        if (e.button == 2 || e.button == 3) {
            e.preventDefault();
      return false;
      }
  }
}
if (navigator.appName=="Netscape" && parseInt(navigator.appVersion)==4) { 
  document.onmousedown=NSclick;
  document.captureEvents(Event.MOUSEDOWN);
}
if (navigator.appName=="Netscape" && parseInt(navigator.appVersion)>=5) { 
  document.onmouseup=NSclick;
}
if (navigator.appName=="Microsoft Internet Explorer") { 
  document.oncontextmenu = new Function("return false;")
  
}

//nots
function disableselect(e){
return false
}
function reEnable(){
return true
}
//if IE4+
document.onselectstart=new Function ("return false")
//if NS6
if (window.sidebar){
document.onmousedown=disableselect
document.onclick=reEnable
}
</SCRIPT>