nagromme said:In fact, I can only think of twice that he's done it at all (spoiler warning for Buffy and Angel). Buffy and Spike. Both had magical deaths, and both had a LONG row to hoe to get back to "normal life." No simple resurrection in either case. (I don't count Angel--he wasn't exactly killed, just "sent away.")
Don't forget Joyce (Buffy & Dawn's mom), but I think that one was better left buried!
If you count the show Angel, the resurrection count gets much higher (Darla and Harmony come to mind, but I think there were more). Again, only for magical deaths, or magical creatures.
But you're correct, I don't see resurrections happening in Firefly. It doesn't fit with the feel of the show.