The Mozilla may not have even launched Firefox 4, but they already have plans for the next three major versions after that. Evidence of this was shown in the RoadMap Firefox, a kind of script where Mozilla establishes what they have planned for the year and that was updated yesterday. He says: Firefox 5, 6 and 7 will still appear in 2011. Further details of the script also show that Mozilla plans to support more operating systems and never let the browser lost user data. I hope they can.