diff --git a/prefs/zen/session-store.yaml b/prefs/zen/session-store.yaml
index ede2bf75f..dc2e97d4c 100644
--- a/prefs/zen/session-store.yaml
+++ b/prefs/zen/session-store.yaml
@@ -6,4 +6,4 @@
   value: true
 
 - name: zen.session-store.log
-  value: true
+  value: false
diff --git a/prefs/zen/window-sync.yaml b/prefs/zen/window-sync.yaml
index 010d357f2..f3e30f29d 100644
--- a/prefs/zen/window-sync.yaml
+++ b/prefs/zen/window-sync.yaml
@@ -6,4 +6,4 @@
   value: true
 
 - name: zen.window-sync.log
-  value: true
+  value: false