No, you can't use it for LMDE. restricted-extras is a meta package for Ubuntu containing the pks
If you have these packages installed you have the same as restricted-extras but for LMDE/Debian.
I believe in everything, except humans.
LM9, Debian Testing Xfce, Debian Sid Xfce - CPU/Amd64 2,6Ghz, Graphics/Nvidia 9600 GT, Sound/SB Audigy4 emu10K1