diff --git a/chrome/content/quickfolders.js b/chrome/content/quickfolders.js
index e7bd721e0..10282b188 100644
--- a/chrome/content/quickfolders.js
+++ b/chrome/content/quickfolders.js
@@ -1159,7 +1159,11 @@ var QuickFolders = {
 						if (psib.label) util.logDebugOptional("dnd", "check next sibling + " + psib.nodeName + " '" + psib.label +"' ...");
 						if (psib.nodeName === 'menu' && popupStart !== psib) {
 							if (psib.label) util.logDebugOptional("dnd", "Hiding previous popup menu.");
-							psib.children.forEach(x => { if (x.tagName=='menupopup') x.hidePopup(); });
+              // HTMLCollection
+              for (let x of psib.children) {
+                if (x.tagName=='menupopup') x.hidePopup();
+              }
+							// psib.children.forEach(x => { if (x.tagName=='menupopup') x.hidePopup(); });
 						}
 						psib = psib.nextSibling;
 					}
@@ -1168,7 +1172,10 @@ var QuickFolders = {
 						if (psib.label) util.logDebugOptional("dnd", "check previous sibling + " + psib.nodeName + " '" + psib.label +"' ...");
 						if (psib.nodeName === 'menu' && popupStart !== psib) {
 							if (psib.label) util.logDebugOptional("dnd", "Hiding previous popup menu.");
-							psib.children.forEach(x => { if (x.tagName=='menupopup') x.hidePopup(); });
+              for (let x of psib.children) {
+                if (x.tagName=='menupopup') x.hidePopup();
+              }
+              // psib.children.forEach(x => { if (x.tagName=='menupopup') x.hidePopup(); });
 						}
 						psib = psib.previousSibling;
 					}
diff --git a/manifest.json b/manifest.json
index 33068bd09..acad6b40a 100644
--- a/manifest.json
+++ b/manifest.json
@@ -3,7 +3,7 @@
   "manifest_version" : 2,
   "name" : "QuickFolders",
   "description" : "Bookmark your favorite mail folders in Thunderbird.",
-  "version" : "5.0pre80",
+  "version" : "5.0pre82",
   "developer" : { 
       "name" : "Axel Grude",
       "url" : "http://quickfolders.org/index.html"
diff --git a/revision.txt b/revision.txt
index 2f38214ba..2900e0d06 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-79 
+82