  We study linearized massive gravity on the de Sitter background. With a
small-enough graviton mass this may have had relevance to inflation, or the
present-day cosmic acceleration. Higuchi has shown that this theory has a ghost
as long as the dS curvature exceeds the graviton mass, 2H^2 > m^2; this would
entail rapid instabilities. In this work we extend the model and observe that
the helicity-0 mode which is a ghost, can be turned into a positive energy
state via kinetic mixing with the conformal mode. The latter gets restricted
here by the requirement that the Bianchi identities be satisfied. This
eliminates the ghost from the linearized theory. However, the spectrum still
contains scalar tachyonic instabilities with the time scale ~1/H. This would
have been problematic for the early univesre, however, may be acceptable for
the present-day accelerated expansion as the tachyon instability would take the
age of the universe to develop.
