This has happened to me too many times already. Firefox deletes an image from ALL the galleries when I use it with
the Samsung Smartphone and am trying to delete it from just one gallery.
I have checked it and doubled checked it. There is no doubt about it.
So, here is my suggestion:
Have a requester appear, when "All Galleries" is being used for deletion of an image,
that says the following:
Do you really want to delete this image from all the galleries?
Thank you!
Soulis