Package: chromium Version: 63.0.3239.40-1 Starting from version 63.0.3239.84-1, Chromium is compiled against GKT+ 3. This is a bad idea. I have noticed the huge trend in Debian's repo. More and more packages are compiled against GTK3 instead of GTK2.
GTK+3 is not an upgrade from GTK+ 2, it is a bastardization. https://igurublog.wordpress.com/2012/11/05/gnome-et-al-rotting-in-threes https://mail.gnome.org/archives/gtk-devel-list/2017-December/msg00051.html >"Application developers (not the users) are the ones that ought to decide how >their application looks and behaves." My suggestion is provide two packages, "chromium-gtk2" and "chromium-gtk3", compiled against GTK2 and GTK3 respectively.
