Mozilla’s tradition is code naming Firefox major releases after national parks from around the world, and, since recently, Thunderbird major releases after beaches. The latter we have seen with the first development release of Thunderbird 3.3 code named Miramar. For whatever reason there has not been much use of the code name for Firefox 4, especially given we are nearing the release of Beta 8. Percy at Mozilla Links did a little digging and found the code name for Firefox 4 is Tumucumaque, borrowed from the Tumucumaque Mountain National Park in Northwest Brazil.