AntiFirmament
Removes the dreadful packet Firmament attempts to send to servers (e.g., Hypixel), which shows your mod IDs when Fabric itself doesn't.
About this Mod
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~
Available Versions
How to Install AntiFirmament on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "AntiFirmament". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
AntiFirmament server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is AntiFirmament compatible with fabric?
AntiFirmament officially supports fabric for Minecraft 1.21.11, 1.21.10. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with AntiFirmament – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if AntiFirmament consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
Similar Mods
Rent Modded Server
Install AntiFirmament with just one click on your server.