You Do Need power plug adapter while traveling from Western Sahara 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 Western Sahara are C and E. This is how they look like.

Western Sahara

In Western Sahara, outlets of type C and E are in use.

Type C

Type E

Liberia

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

Type A

Type B

Type C

Type F