v1.4.2 is a release file of the Minecraft mod FabricProxy for Fabric, made for Minecraft 1.16.4. It was published on December 25, 2020 and is 0.2 MB in size. For the full description, screenshots and every other version, visit the FabricProxy mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.