
Add a fuel variant for the furnace, from a coal rod to an ingot that can burn up to 128 objects:
Read the changelog for obtain the original file (.jar)
Coal rod: 24 items
duration: 4800 ticks
Magma block: 10 items
duration: 2000 ticks
Magmatic alloy: 32 items
duration: 6400 ticks
Superheated alloy: 128 items
duration: 25600 ticks
Lava bottle: 20 items
duration: 4000 ticks
Coal rod superheated: 48 items
duration: 9600 ticks
Overloaded coal: 32 items
duration: 6400 ticks
To obtain the lava bottle and superheated coal, you have to right-click on the lava.
The mod is in en-us (english) and es-es (spanish), but I plan to update the languages.