Tabb became the first woman to officiate a World Snooker Championship final at the 2009 event. John Higgins defeated Shaun Murphy 18–9 to capture his third world title. Three years later, Tabb also refereed the 2012 World Snooker Championship final, in which Ronnie O'Sullivan defeated Ali Carter by 18–11 to win his fourth world title. As of 2020, she is the only female referee to officiate a world championship final.