Firebird

User Agent
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6b) Gecko/20031212 Firebird/0.7+
Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4b) Gecko/20030516 Mozilla Firebird/0.6
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:x.xx) Gecko/20030504 Mozilla Firebird/0.6
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6a) Gecko/20031002 Firebird/0.7