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

Djibouti

In Djibouti, 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