diff --git a/.config/niri/main.kdl b/.config/niri/main.kdl
index c9ae6091..91ebae97 100644
--- a/.config/niri/main.kdl
+++ b/.config/niri/main.kdl
@@ -93,7 +93,7 @@ window-rule {
 window-rule {
     match app-id="firefox$"
     default-column-width {
-        proportion 0.8
+        proportion 0.5
     }
     clip-to-geometry true
 }