
Modrinth · Minecraft mod
AntiFirmament
Removes the dreadful packet Firmament attempts to send to servers (e.g., Hypixel), which shows your mod IDs when Fabric itself doesn't.
Quick answer
Which AntiFirmament release should I use?
AntiFirmament 1.0.2 targets 26.1.2 with Fabric. It must be installed on the client. Do not install it on the dedicated server. No extra mods listed for this file.
Where it goes
Is AntiFirmament required on the client, server, or both?
It must be installed on the client. Do not install it on the dedicated server.
This file is marked client-only.
What else does AntiFirmament 1.0.2 need?
1.0.2. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add AntiFirmament without breaking your instance.
Built for AntiFirmament 1.0.2. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.0.2. It targets 26.1.2 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
It must be installed on the client. Do not install it on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.0.2. It opens that exact file at the source.
About this project
What does AntiFirmament add?
AntiFirmament
because privacy matters
This mod attempts to block the ModAnnouncer packet the mod Firmament attempts to send while joining servers.
This is NOT normal Fabric behavior - as only Forge has a mod announcer built in, and personally I don't see a need for one to exist in Fabric. No server is required to see my mod's folder (MOD IDs) and no singular mod should be sending this information out without prior consent/knowledge.
License
I am a catboy; therefore, everything is open source. Feel free to skid this 52 different times, I really don't care. If it breaks dm me on discord - @axle.coffee or open a github issue or fix it yourself and open a PR
MY code is licensed under MIT
The logo is a derivative of the Firmament logo by ic22487 located here which is licensed under CC-BY-4.0 and was modified by me to have an X over it.
The original author of the image, the contributors and code owners of FirmamentMC do not endorse this project.
I (Axle) and AntiFirmament do not intend to cause any tarnishment to the reputation of FirmamentMC and the creator of the logo - it's simply an easy way to convey "hey this blocks something of Firmament" meow~
Project description from Modrinth.
Pick your setup
AntiFirmament by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.11
1 loader build1.21.10
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
AntiFirmament versions and loaders
1.0.2
antifirmament-fabric-1.0.1-26.1.2.jar
22 Jun 2026
1.0.1
antifirm-1.0.1.jar
10 Feb 2026
1.0.0
FuckFirmament-1.0.0.jar
2 Feb 2026
Looking for an older file? The official Modrinth project page is in Resources.