A what? What is a "firing pin safety?"
There are several things to say about firing pins and safety. First, most automatic pistols are designed with an "inertia" firing pin. That means that the firing pin is shorter than the distance between the face of the hammer (when it is down) and the primer of the cartridge in the firing chamber. The firing pin is hit with enough force so that when it flies forward it has enough momentum to set off the primer. (I guess somebody decided to call that inertia instead.) This kind of firing pin does not protrude from the face of the bolt when the hammer is down. In theory, dropping the gun on its muzzle, or striking the hammer against an object, will not impart enough force to the firing pin to fire a cartridge.
The Tokarev was designed with a "full reach" firing pin. That means it is a bit longer than than the distance from the lowered hammer face and the primer. This kind of firing pin protrudes from the bolt face when the hammer is down. In that case, any blow on the hammer (when it is down) is transmitted directly to the primer. The Colt Single Action Army was like that when the hammer was down, and was famously supposed to be carried with an empty chamber under the hammer. I guess the Russians did this to ensure more reliable ignition.
Second, I said
in theory an inertia firing pin will not set off a cartridge if the gun is dropped or struck. But that is only good for a certain maximum height or a force. Exceed that will fire the gun. The trend has been to give pistols internal safety devices that positively lock the firing pin in place except when the trigger is pulled.
Colt actually did this put such a device in civilian-market 1911s as early as 1937. It was called the Swartz safety, but they discontinued it in 1941, when they began making pistols for the Army again. This kind of device became more and more common as time went on, and is now the norm on combat pistols. This is what people mean now when they talk about a firing pin safety. I think the German had a similar device for police Lugers in the 1920's or 30's as well
It may not be possible to fit a Tokarev with such a device, because of the "packaged" nature of the firing system, but that is guesswork on my part. I think it would also need to be given an inertia firing pin for that, but that should be easy. Perhaps just shortening the existing full reach pin would work, although it would have to have sufficient mass to crush the primer.
PS - The Savage 32/380 automatics also have a full reach firing pin. They cannot be given an inertial one, because the "hammer" on the Savage is not a hammer. It is a cocking lever, connected directly to the firing pin/striker. The only safe way to carry a Savage with a round in the chamber is cocked with the safety (awkward as it) applied.