diff --git a/src/browser/components/preferences/zen-settings.js b/src/browser/components/preferences/zen-settings.js
index 017e8bc88..81801cba3 100644
--- a/src/browser/components/preferences/zen-settings.js
+++ b/src/browser/components/preferences/zen-settings.js
@@ -799,7 +799,7 @@ var gZenCKSSettings = {
 
   //TODO Check for duplicates
   async _handleKeyDown(event) {
-    if (!this._currentActionID) {
+    if (!this._currentActionID || document.hidden) {
       return;
     }