The Manipulate a Window action allows you to work with a specified window in a specified application.
Select the operation on the window. As you choose various operations other selections become possible. For example, if you select Scale size by then you will be able to specify width and height.
Window operations:
The Move and Resize operation has a submenu:
Select the window to work with:
Select the application to work with, including Front Application from the in pop-up.