На англоязычной странице для разработчиков Mozilla Developer Center написано, что 3.1 переименуют в 3.5 сразу как выйдет beta 4:
Firefox 3.1 beta 3 is now available for developers to test on. Note that this version is going to be renumbered to 3.5 when beta 4 is released. See Firefox 3.5 for developers for further information.
Источник: TG Daily
Firefox 3.1 beta 3 is now available for developers to test on. Note that this version is going to be renumbered to 3.5 when beta 4 is released. See Firefox 3.5 for developers for further information.
Источник: TG Daily