Quick answer — fripSide performed 2 anime themes, including "final phase" from A Certain Scientific Railgun T, "only my railgun" from A Certain Scientific Railgun.
fripSide performed the anime theme songs "final phase" (A Certain Scientific Railgun T), "only my railgun" (A Certain Scientific Railgun).
fripSide's first listed anime theme is "final phase", the opening of A Certain Scientific Railgun T.
