I'm glad this thread is here. I had the same question, and it sounds like lighting a fire in the fireplace is safe.
I was also outside looking for firewood in the forest today. I found a few branches which were too long for firemaking, and so I broke them into smaller pieces. After breaking one of the largest branches, my tinnitus immediately spiked in my bad ear. Only after that did it occur to me that breaking branches can be loud. So I won't be doing that anymore. Hoping the spike goes back down of course.