eww-desktop-remove-duplicates

eww-desktop-remove-duplicates is a variable defined in `eww.el'.
Its value is

t

Documentation:
Whether to remove duplicates from the history when saving desktop data.
If non-nil, repetitive EWW history entries (comprising of the URI, the
title, and the point position) will not be saved as part of the Emacs
desktop. Otherwise, such entries will be retained.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 25.1 of Emacs.