Anṣuf ar SeaMonkey n izegrar.
Rnu timahilin neɣ iɣunab nniḍen akken ad terreḍ SeaMonkey d ayla-k.
MdelAcegger n Old Default Image Style sɣuṛ Fusionman
Yettwasezmel 5 ɣef 5 n yetran
Much Thanks to Dagger (developer) for fast reply here and double Thanks for Dagger's steadfast attention.
I have nothing against black backgrounds but I mostly end up removing them for stand-alone viewing and editing, when necessary.
Meantime, Much Appreciation to steeviebops for that (obvious) remedy.  Should have tried that first.  Dagger will hopefully develop a suitable fix.  Meantime, I'll just apply your solution.  
Again, very grateful to both.
Ma ulac aɣilif ini-d acuɣeṛ:
Akken ad ternuḍ tigrummiwin inek, yessefk ad yili ɣur-k umiḍan n izegrar Mozilla.
 Izegrar
    Izegrar
 
    