It suggests two things. It is possible that your being fired was not a reflection on your job performance but instead on your boss. Second, it reflects a work environment with significant churn and little job security.
There was a boss at my old company who fired a lot of people, one after the other. He didn't fire me, but he did give me problems. He always picked on "problem employee" to harass and eventually fire. Anyway, it took some time but management cottoned on to his unprofessional performance and he was fired. I suspect he acted the way he did to make it seem like he was in charge, had a lot of responsibility, and was needed to manage and put into place all of the "problem" employees. Also, by going on the offensive he was able to deflect from his own failings.