Labeled Chest Use Passthrough (LCUP) is an extremely simple plugin. When a player Interacts with a sign or item frame, it'll check the block the sign is attached to and open it if it is a Container (chest, dispenser, etc.) or Ender Chest. There are no permissions. The configuration is extremely simple and only has an option to disable the item frame handler.
Code (YAML):
config-version: 1
#Enable the item frame handler that requires players to be sneaking enable-item-frame-handler: true
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