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

Here is Why You Need An Adapter

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

Mozambique

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

Type C

Type F

Type M

Gibraltar

In Gibraltar, outlets of type G are in use.

Type G