You Do Need power plug adapter while traveling from Swaziland to Lebanon.

Here is Why You Need An Adapter

The outlet and plug type used in Lebanon are C, D and G and in Swaziland is M. This is how they look like.

Swaziland

In Swaziland, outlets of type M are in use.

Type M

Lebanon

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

Type C

Type D

Type G