I am reading many articles online that show how to adjust margins and print labels, but then when I try to apply this to actual Firefox the options are not there.

Why were these removed? This is yet another reason i CANT use firefox anymore. Because the interface is degenerating so fast nothing is useful anymore. Now I can't even print a simple label without it extending outside of the margins. FF please work on fixing your software, but please stop removing useful options. thx