You Do Need power plug adapter while traveling from Slovenia to Mozambique.

Here is Why You Need An Adapter

The outlet and plug type used in Mozambique are C, F and M and in Slovenia are C and F. This is how they look like.

Slovenia

In Slovenia, outlets of type C and F are in use.

Type C

Type F

Mozambique

In Mozambique, outlets of type C, F and M are in use.

Type C

Type F

Type M