You Do Need power plug adapter while traveling from Lebanon 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 Lebanon are C, D and G. This is how they look like.

Lebanon

In Lebanon, outlets of type C, D and G are in use.

Type C

Type D

Type G

French Guiana

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

Type C

Type D

Type E