Can you remove firebrick from masonry fireplace?

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SculptureOfSound

Feeling the Heat
Sep 9, 2017
372
Wisconsin, USA
I don't plan on ever going back to an open fireplace after installing an insert, so can I remove firebrick from inside the firebox to give myself some more working room (I'd like to put insulation into the newly created space).

It's an external, full masonry chimney.