Item Finder addon
Item Finder addon does only one thing, but does it well - it finds blocks in chests you specify. In the game, the item finder looks like a magnifying glass. On activation, it asks you to specify the block you want to find and the search radius. The searching process will take time. If the block is contained in any of the chests nearby, it will be highlighted in yellow.
Credits: RedTNT
Credits: RedTNT