i just wanted this, thank you

Working in FF 63.0.3 (64-bit).
Let you pick your installed themes from a drop-down list.
Simple, clear and useful.
Thumbnails / preview when hovering over a list item would be nice :-).
Thank You Tusharkanth

This does all I ask of it. ;)

Still working Firefox 62.0.2

A simple and straightforward but useful extension that makes it even easier to switch between themes.