Coming June 29th. Firefox 5 is said to be tighter when it comes to the user interface design, alongside a deeper set of features. Firefox 5 is already touted to be in its 2nd stage of development by the time the middle of April rolls round, Firefox 5 will concentrate on the current tab-centric usability, throwing in muti-select abilities that allows a user to have more than one tab open in the same screen simultaneously.