Crop Layer To Mask
Introduction
This plug-in crops the selected layers to the content of the layer mask with an optional margin.
Plug-in Menu Location
Layer > Crop Layer to Mask
Keyboard Shortcut
This forces Artbox to save the shortcut for the next session. First, search for the plug-in name, and assign a shortcut.
Edit > Keyboard Shortcuts
Once the shortcut is working as you like, save your work then;
File > Quit
When Artbox restarts, your plug-in should be activated by the assigned key.