Diffuse On-Off is a script for 3ds Max that switches the display of diffuse textures on or off in the viewport. The toggle is driven by object selection, so you pick the objects and change their diffuse texture display from there.
Its stated purpose is to skip a trip to the materials panel. Instead of opening that panel to change how a diffuse texture shows, you handle the switch directly from your selection in the viewport. The current version is 2.3.5.
Diffuse On-Off comes from Chuggnut and appears in the ScriptSpot library. For the download, any usage notes and current licensing terms, visit the developer's page at chuggnut.com. This catalog lists it as free, making it a small utility you can add to a 3ds Max workflow without cost.