When a player has no mods, Payday 2 will show the strange characters 7D66A433BE3A1FE2 in the Mods section of their lobby instead of actually showing no mods.
It is probably an oversight from OVK, the string is uninformative and useless.
7D66A433BE3A1FE2 Remover removes the 7D66A433BE3A1FE2 string for unmodded lobbies, correctly showing them as having no mods at all. The full mods list is still shown if the lobby does actually have mods.