Daca apasam butonul suntem insa avertizati.
In cazul in care continuam sa apasam acesta dispare.
Verificand insa sursa dam peste urmatoarea bucata de cod:
 <xul:button xmlns:xul=”http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul” id=”errorTryAgain” label=”Please do not press this button again.” label2=”Please do not press this button again.” oncommand=”robotButton();” style=”visibility: hidden;”/>
Daca vizitam pagina http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul suntem informati ca nu exista date, ci doar XUL. Ei bine, XUL este XML User Interface Language, iar astfel Mozilla aduce un mesaj dedicat „Application developers and development managers who seek to better understand XUL and why the Mozilla platform is built with it.”
O metoda interesanta aleasa de Mozilla pentru a-si promova tehnologiile.
Update ulterior: incercati si adresa about:mozilla