GM Vision (Foundry VTT Module)
This module adds a toggleable mode for GMs that ...
- increases the brightness of the scene,
- reveals the fog of war, and
- shows all tokens even if they wouldn't be visible normally from the perspective of the selected token.
Tokens that wouldn't be visible normally are highlighted by a hatched overlay.
The mode is toggled by a keybinding (default: CTRL+G). The light bulb icon of the lighting controls button indicates whether it's active (
: inactive; 
: active).