How can I achieve write permission in Konqueror?

I’m trying to copy some files into Firefox’s folder which is read-only/belongs to root. I don’t know how to open Konqueror with root privileges.

Have you tried using

sudo konqueror

in a terminal?

I’ve tried it before, and this is the output it gives me. I’m still learning the terminal, so I don’t know what this means.

To be clear: you are trying this in a terminal emulator in Plasma, something like konsole, right?

Can you open Konqueror by just typing

konqueror

in a terminal?