You Do Need power plug adapter while traveling from Norfolk Island to Liberia.

Here is Why You Need An Adapter

The outlet and plug type used in Liberia are A, B, C and F and in Norfolk Island is I. This is how they look like.

Norfolk Island

In Norfolk Island, outlets of type I are in use.

Type I

Liberia

In Liberia, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F