diff --git a/browser/base/content/browser.xul b/browser/base/content/browser.xul
index 65c01c6778d6..7201f03355c2 100644
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -1270,7 +1270,7 @@ xmlns="http://www.w3.org/1999/xhtml"
       <vbox id="appcontent" flex="1">
         <notificationbox id="high-priority-global-notificationbox" notificationside="top"/>
         <tabbox id="tabbrowser-tabbox"
-                flex="1" eventnode="document" tabcontainer="tabbrowser-tabs">
+                flex="1" tabcontainer="tabbrowser-tabs">
           <tabpanels id="tabbrowser-tabpanels"
                      flex="1" class="plain" selectedIndex="0"/>
         </tabbox>
diff --git a/toolkit/content/widgets/tabbox.js b/toolkit/content/widgets/tabbox.js
index 729a93486364..018b2f90a1d9 100644
--- a/toolkit/content/widgets/tabbox.js
+++ b/toolkit/content/widgets/tabbox.js
@@ -14,27 +14,13 @@ class MozTabbox extends MozXULElement {
   }
 
   connectedCallback() {
-    switch (this.getAttribute("eventnode")) {
-      case "parent":
-        this._eventNode = this.parentNode;
-        break;
-      case "window":
-        this._eventNode = window;
-        break;
-      case "document":
-        this._eventNode = document;
-        break;
-      default:
-        this._eventNode = this;
-    }
-
-    Services.els.addSystemEventListener(this._eventNode, "keydown", this, false);
+    Services.els.addSystemEventListener(document, "keydown", this, false);
     window.addEventListener("unload", this.disconnectedCallback, { once: true });
   }
 
   disconnectedCallback() {
     window.removeEventListener("unload", this.disconnectedCallback);
-    Services.els.removeSystemEventListener(this._eventNode, "keydown", this, false);
+    Services.els.removeSystemEventListener(document, "keydown", this, false);
   }
 
   set handleCtrlTab(val) {
@@ -113,19 +99,6 @@ class MozTabbox extends MozXULElement {
     return tabpanels && tabpanels.selectedPanel;
   }
 
-  set eventNode(val) {
-    if (val != this._eventNode) {
-      Services.els.addSystemEventListener(val, "keydown", this, false);
-      Services.els.removeSystemEventListener(this._eventNode, "keydown", this, false);
-      this._eventNode = val;
-    }
-    return val;
-  }
-
-  get eventNode() {
-    return this._eventNode;
-  }
-
   handleEvent(event) {
     if (!event.isTrusted) {
       // Don't let untrusted events mess with tabs.