The Fire Axe is an Axe that can be used to break entire trees at once, and has infinite durability.
When a Log is mined, it searches for up to 10,000 connected Logs, up to 100 blocks away, and breaks them all at once.
Additionally, any enchantments placed on the Fire Axe via an Anvil will be doubled. Efficiency IV becomes Efficiency VIII, etc.
Configuration
What blocks it can mine is defined by the block tag #excessive_utilities:mineable/fire_axe. By default, this includes:
#minecraft:logs