/etc/xdg/khtml.categories is in libkf5khtml-data 5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | kf5.khtml khtml (lib)
kf5.khtml.javaappletviewer javaappletviewer
kf5.khtml.multipart multipart
|