To dream of firemen represents you or someone else that is doing everything possible to deal with a problem that has gotten out of control. A need to restore stability to a situation where negligence, carelessness, or oversights allowed a problem to exacerbate into a serious problem. Preventing a problem from spreading uncontrolled.
Feelings about other people in your life needing to fix your life for you. Jealousy of having been proven incompetent to the point of needing others to restore order for you. Feelings about a hero in your life saving you from a problem. Feelings about God reversing a problem.
Negatively, a firefighter in a dream may reflect feelings of embarrassment that you didn’t listen to a warning or advice from an authority figure. Feeling stupid that your enemies or competition is able to contain a problem you created for them.
Example: A young woman dreamed of seeing her brother wearing a firefighter uniform and then later realized that the uniform had been taking off and left on the ground. In waking life she felt that a mentor at work was very helpful to her to solve problems in the workplace, but slowly began to feel that this mentor at work was a fake person who didn’t really like her. The firefighter uniform may have reflected her feelings about the personality of the mentor at work feeling obligated to help her fix problems at work while she was training for her job.