diff --git a/chrome/content/zotero/locateMenu.js b/chrome/content/zotero/locateMenu.js
index 42a4d2acc9..a46fa5afd1 100644
--- a/chrome/content/zotero/locateMenu.js
+++ b/chrome/content/zotero/locateMenu.js
@@ -384,8 +384,8 @@ var Zotero_LocateMenu = new function() {
 			return _getURL(item).then((val) => val !== false);
 		}
 		this.handleItems = Zotero.Promise.coroutine(function* (items, event) {
-			var urls = yield Zotero.Promise.all([for (item of items) _getURL(item)]);
-			ZoteroPane_Local.loadURI([for (url of urls) if (url) url], event);
+			var urls = yield Zotero.Promise.all(items.map(item => _getURL(item)));
+			ZoteroPane_Local.loadURI(urls.filter(url => !!url), event);
 		});
 		
 		var _getURL = Zotero.Promise.coroutine(function* (item) {
diff --git a/chrome/content/zotero/tagColorChooser.js b/chrome/content/zotero/tagColorChooser.js
index 9bc4a51f57..842469b1a0 100644
--- a/chrome/content/zotero/tagColorChooser.js
+++ b/chrome/content/zotero/tagColorChooser.js
@@ -70,7 +70,10 @@ var Zotero_Tag_Color_Chooser = new function() {
 			}
 			else {
 				// Get unused color at random
-				var usedColors = [for (x of tagColors.values()) x.color];
+				var usedColors = [];
+				for (let x of tagColors.values()) {
+					usedColors.push(x.color);
+				}
 				var unusedColors = Zotero.Utilities.arrayDiff(
 					colorPicker.colors, usedColors
 				);
diff --git a/chrome/content/zotero/xpcom/quickCopy.js b/chrome/content/zotero/xpcom/quickCopy.js
index 25fc5e5de1..5526a2b7fd 100644
--- a/chrome/content/zotero/xpcom/quickCopy.js
+++ b/chrome/content/zotero/xpcom/quickCopy.js
@@ -71,7 +71,12 @@ Zotero.QuickCopy = new function() {
 			+ "WHERE setting='quickCopySite'";
 		var rows = yield Zotero.DB.queryAsync(sql);
 		// Unproxify storage row
-		_siteSettings = [for (row of rows) { domainPath: row.domainPath, format: row.format }];
+		_siteSettings = rows.map(row => {
+			return {
+				domainPath: row.domainPath,
+				format: row.format 
+			};
+		});
 	});
 	
 	
diff --git a/components/zotero-autocomplete.js b/components/zotero-autocomplete.js
index b6ec52e541..d7ba672e48 100644
--- a/components/zotero-autocomplete.js
+++ b/components/zotero-autocomplete.js
@@ -231,10 +231,10 @@ ZoteroAutoComplete.prototype.startSearch = Zotero.Promise.coroutine(function* (s
 		if (resultsCallback) {
 			resultsCallback(results);
 			this.updateResults(
-				[for (x of results) x.val],
-				[for (x of results) x.comment],
+				Object.values(results).map(x => x.val),
+				Object.values(results).map(x => x.comment),
 				false
-			)
+			);
 		}
 		resultCode = null;
 		Zotero.debug("Autocomplete query completed");