Firebird is an old engine no longer under development since 2009. There is nothing available that I can see about current versions.
Here is a link to a chessprogramming wiki on nodes that seems pretty well written.
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many thanks notmtwain and fiveofswords
i wanna know if a chess engine is strong only by its node calculation....because i doubt as firebird calculated 7,000,000 nodes in 2 seconds while stockfish6 and every other best engine (komodo , critter etc) reached just b/w 1,000,000-3,000,000....please tell...i use arena...