This is an addon that shows how much you have earned on a character in gold, silver and copper. You can also use it to see how much money you have earned in a session and the session persists through logins and logouts, and through characters, so you can record how much you earned in a session totalling all characters you have used during that session.
There is a checkbox you can use to chose if you want the session to persist or not. You can reset a session with the reset button, and you can pause the session with the pause button.
To start the addon type /lzmdc