Firebox Insulation?

Found what appears to be insulation in the firebox of a fireplace. I am thinking it may have been brought there by a mouse. Any other ideas?

Matt, those are “glowing embers” typically found in vented gas log sets.

You are joking right?

http://thefireplaceandchimneyshop.com/access_db/charredoak.jpg

2009 thread.

NACHI to add “how to properly use the forum” course?

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