Dreams and visions of fire tell you about the projection and reflection of your innermost self, your source, your base and so on. You feel the passion, desire and enlightenment and transformation in life.
Another reflection or projection is anger, fear, sadness, aggression, trauma, and stress that you cannot control and must express. You can experience it as reaching a peak or boiling point that has to erupt. The expression of the deepest true feelings comes from your source, your base your heart and so on.
Another explanation is that something old in your life is giving way to something new and must burn down before you can build again. An addition to this is a memory of a previous life and / or a trauma or fearful experience that you are processing.
An alternative explanation is that your way of thinking is changing. You undergo an inner transformation; you have the fire under control. Yet another explanation is that fire represents your drive and motivation, strength and passion for life.