Click the extension's toolbar button, then switch to another Chrome window — selected tab(s) will move to that window.
Usually you have just the current tab selected, but Chrome also has built-in functionality to select multiple tabs:
— To select specific tabs in a window, click tab handles while holding down Cmd (Mac) or Ctrl (Windows) key.
— To select a range of tabs, click tab handles while holding down the Shift key.
Source code: https://github.com/ivan7237d/move-tabs