MagmafurnaceDoubleTrouble.jar is a release file of the Minecraft mod MagmaFurnace - Weapons, Bosses and More!, made for Minecraft 1.16.5. It was published on February 22, 2022 and is 16 MB in size. For the full description, screenshots and every other version, visit the MagmaFurnace - Weapons, Bosses and More! mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.