The ornamental design for a glassfirescreendoorunit, as shown and described.
FIG. 1 is a perspective view of a glass firescreen door unit showing my new
design, the broken line showing of a fireplace surround is for
illustrative purposes only and forms no part of the claimed design.
FIG. 2 is a right hand end view thereof, in elevation, the opposite end
view being substantially a mirror image thereof.