Here's the thing: I store full firefly jars in an SBD. The problem is, when I go to deposit a freshly filled jar or two or three, it's too easy to click "add all."
THEN I wind up with SBD with some empty and some full jars. Not useful.
If I've started by putting a FULL firefly jar in an SBD, it should only accept FULL JARS thereafter. Please.
ETA: and it would help if the display icon showed a full jar!