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

Israel

In Israel, outlets of type C and H are in use.

Type C

Type H

French Guiana

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

Type C

Type D

Type E