You Do Need power plug adapter while traveling from Morocco to French Guiana.

Here is Why You Need An Adapter

The outlet and plug type used in French Guiana are C, D and E and in Morocco are C and E. This is how they look like.

Morocco

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

Type C

Type E

French Guiana

In French Guiana, outlets of type C, D and E are in use.

Type C

Type D

Type E