Mozilla Firefox withdraws its new release amid fears over security. This exceptional step was taken just after a day following its distribution. What underlies this move is a critical vulnerability with the browser according to the company. Firefox, one of the big three leading web browsers – and is thought to have more than 450 million users worldwide and around 29 per cent of the worldwide share. It claims that only a small number of users will be affected by this step. In an updated version of its open source browser, the company detailed the security fixes, including fixing 14 security holes and 11 of these holes are rated as “critical”.