I remember when Mozilla "Firebird" had to change its name to Firefox because the RDBMS guys strongly objected. At the time, I had never heard of the database pr

I remember when Mozilla "Firebird" had to change its name to Firefox because the RDBMS guys strongly objected. At the time, I had never heard of the database project. Nine years later, I'm still not familiar with it. Is it widely used? What's keeping it from being as well known as MySQL or PostgreSQL?