$ sudo apt-get update
$ sudo apt-get install konqueror-nsplugins 

konqueror-nsplugins is installed in your system.

Make ensure the konqueror-nsplugins package were installed using the commands given below,

$ sudo dpkg-query -l | grep konqueror-nsplugins *

You will get with konqueror-nsplugins package name, version, architecture and description in a table

konqueror-nsplugins package basic information: