This window is used to customize the layout of the on-screen buttons. The window is accessed by right clicking any of these buttons.
You can drag and drop buttons to and from this window, from the tool bars. Tool bars exist on both sides of the screen, and at the bottom.
The buttons will be displayed according to each toolbar's settings: icons, text labels, or both.
The following toolbar buttons are available:
Below are these three buttons:
See this video for a tutorial.
See this page for documentation on Firestorm 4.7.3 (47323) and earlier.