You Do Need power plug adapter while traveling from Lesotho to Gabon.

Here is Why You Need An Adapter

The outlet and plug type used in Gabon is C and in Lesotho is M. This is how they look like.

Lesotho

In Lesotho, outlets of type M are in use.

Type M

Gabon

In Gabon, outlets of type C are in use.

Type C