You Do Need power plug adapter while traveling from Kosovo to Montserrat.

Here is Why You Need An Adapter

The outlet and plug type used in Montserrat are A and B and in Kosovo are C and F. This is how they look like.

Kosovo

In Kosovo, outlets of type C and F are in use.

Type C

Type F

Montserrat

In Montserrat, outlets of type A and B are in use.

Type A

Type B