https://github.com/Tobiti/MFHoppers/wiki /

#It auto saves on disable, so in case of an crash, would recommend to save it every few. The value is in seconds!
saveEvery: 60

Hoppers:

#There's 4 types of hopper: BREAK, CROP, GRIND, MOB
#Break Upgradable values
#limitPerChunk,
#particle,
#lore,
#name,
#breakEvery,
#drops

#Grind Upgradable values
#limitPerChunk,
#lore,
#name,
#defaultMob,
#damage,
#time

#Crop Upgradable values
#limitPerChunk,
#lore,
#name,
#defaultMob,
#crops

#Mob Upgradable values
#limitPerChunk,
#lore,
#name,
#defaultMob,
#drops

"grindHopper":
type: Grind
limitPerChunk: -1 #-1 no limit
name: "&8[&aMobGrind&8] &7Hopper"
lore:
- "&7This hopper teleports specified monster type"
- "&7To it's location & freezes them"
- "&a&l* &7Current mob: %type%"
should_drop_from_explosions: true #This options makes that hopper drops from explosions.
mob: PIG
mob-blacklist:
- "PIG"
#Is isAuto is true
damage: 0.2
time: 10
"mobHopper":
type: Mob
limitPerChunk: -1
name: "&8[&aMob&8] &7Hopper"
lore:
- "&7This hopper picks up mob drops!"
should_drop_from_explosions: true
drops:
- "ROTTEN_FLESH"
"CropHopper":
type: Crop
limitPerChunk: -1
name: "&8[&aCrop&8] &7Hopper"
should_drop_from_explosions: true
lore:
- "&7This hopper picks up crops!"
crops:
- "CACTUS"
"breakHopper":
should_drop_from_explosions: true
type: Break
limitPerChunk: -1
name: "&8[&aBreak&8]&7 Hopper"
lore:
- "Auto breaks blocks above it"
breakEvery: 10
drops:
- "DIAMOND_ORE:10" #Specify the amount that will drop, or use for example: 1-5 so it will choose random number between them!
"breakWithUpgrades":
should_drop_from_explosions: true
type: Break
limitPerChunk: -1
particle: CLOUD
name: "&8[&aBreak&8]&7 Hopper (&a1&7)"
lore:
- "Auto breaks blocks above it"
breakEvery: 10
drops:
- "DIAMOND_ORE:1-4"
upgrades:
"2":
breakEvery: 8
limitPerChunk: -1
priceType: XP
price: 1000
particle: SPLASH
name: "&8[&aBreak&8]&7 Hopper (&a2&7)"
lore:
- "Auto breaks blocks above it"
drops:
- "DIAMOND_ORE:2-5"

GrindConvert:
convert-inventory:
title: "&aChange your grinder mob!"
item-placeholder:
name: "&b%type%"
lore:
- "&7Change your grinder type to %type%"
- "&b&l* &7Price: $%price%"
default-price: 1000

#You can add own prices by specifying Entity name & price
#Ex: COW;1500
#Note: Entity names come from https://hub.spigotmc.org/javadocs/spigot/org/bukkit/entity/EntityType.html

prices:
- "COW:1500"

#Don't want an entity to show up in gui?
#Add it below
#Note: Entity names come from https://hub.spigotmc.org/javadocs/spigot/org/bukkit/entity/EntityType.html

mob-blacklist:
- "GIANT"
- "WITHER"

#Should hoppers level reset after convert by default it will
shouldLevelResetAfterConvert: true

#Allow convert upgraded hoppers
allowConvertUpgradedHoppers: true


UpgradeInventory:
title: "&3&lUPGRADE HOPPER"
infoItem:
name: "&b&lINFO"
material: PAPER
lore:
- "&b&l* &7Level: &b%lvl%"
- "&b&l* &7Type: &b%type%"
- "&b&l* &7Name: &b%name%"
filler_color: "CYAN"
upgradeItem:
material: DIAMOND_BLOCK
name: "&b&lUPGRADE"
lore:
- "&7Click to upgrade your hopper from level &b%lvl% &7to &b%nextlvl%"
HopperConvert:
title: "&3&lConvert Hopper"
itemPricePlaceholder: "&b&l* &7Price: &b%price%$"
hoppers:
- "hopper1:1000"

Because our wiki is down, here's explanation of things.

MF Hoppers Permissions

mfh.reload - access to /mfh reload
mfh.give - access to /mfh give
mfh.linkhopper - access to linking hoppers to chests
mfh.convert - access to /converthopper

Functionality

Linking Hopper
1. Execute /linkHopper while looking at an hopper
2. Click an container (Shulker Box, Dropper, Chest, etc.)

Upgrading Hopper
In order to upgrade an hopper, it must have upgrades.
By default there's one upgradable hopper
called "upgradableHopper"
Then when the hopper with upgrades is placed, shift + click hopper
A menu should pop out.