Fox has fired an extra after the actress tweeted a major spoiler online, and they’re pushing to prevent it from happening again.According to The Hollywood Reporter, ‘Glee’ Extra Nicole Crowther leaked the details on who was going to be Prom King and Queen on an upcoming episode. ‘Glee’ producers were not pleased at all. Co-Creator Brad Falchuk essentially fired the actress on twitter, saying “hope you’re qualified to do something besides work in entertainment.” He went on to say “Who are you to spoil something talented people have spent months to create?” Now Fox is adding extra measures to prevent cast members of it’s shows from leaking major story lines online. Even though Crowther was fired, a source tells THR that cast members’ contracts do not contain non-disclosure agreements, but that will probably change because of the recent leaks. The source says that Fox is considering adding non-disclosure agreements to contracts of all its cast, from series regulars, to extras. They might not set one at all though, since this could be a scary example to everyone considering leaking details of upcoming episodes.