Teddyx

Hello folks, I was wondering whether forge uses official mojang mappings/where i can find obfuscation mappings for forge? also, I know older versions aren't supported in this forum but I'll still ask in hope for someone to be kind enough to answer my question, I have installed an older version of forge (1.8.8) and noticed that there's no jar in versions/forge-1.8.8-<build>, how exactly does that work? And did they modify vanilla mappings in 1.8.9 in any way? Thanks in advance.