Fully Client-Side mod, Fabric API not required.
Windows 10/11 and Linux (KDE) supported

Background Images from facets.la
How to Install Blurred Window (Mod)
Blurred Window by PSJahn is verified for Fabric across Minecraft versions 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1 (latest release: 1.0.5, file size: 244 KB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1) and platform (Fabric).
- Make sure you have the compatible loader or environment installed for Fabric.
- Move the downloaded Blurred Window file into your Minecraft
.minecraft/modsfolder and launch the game.
All Versions
+ Add Version→ Thanks @EnderKill98