@Override
	public boolean isEnabledForContext(NavigatableActionContext context) {
		if (!(context instanceof ListingActionContext)) {
			// Restrict this action to the Listing.  We have guilty knowledge that there are 
			// other sibling classes to this one for other contexts.
			return false;
		}
		return super.isEnabledForContext(context);
	}
Only shows addresses to the code unit at the address for the current context.  This differs
from the normal 'find references' action in that it will find references by inspecting 
context for more information, potentially searching for more than just direct references to 
the code unit at the current address.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/navigation/locationreferences/FindReferencesToAddressAction.java