You Do Need power plug adapter while traveling from Haiti 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 Haiti are A and B. This is how they look like.

Haiti

In Haiti, outlets of type A and B are in use.

Type A

Type B

Liberia

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

Type A

Type B

Type C

Type F