--- a/eric6/WebBrowser/WebBrowserTabWidget.py	Wed Jan 08 18:57:10 2020 +0100
+++ b/eric6/WebBrowser/WebBrowserTabWidget.py	Wed Jan 08 18:58:31 2020 +0100
@@ -1134,7 +1134,10 @@
         Private slot to populate the closed tabs menu.
         """
         fm = self.__closedTabsMenu.fontMetrics()
-        maxWidth = fm.width('m') * 40
+        try:
+            maxWidth = fm.horizontalAdvance('m') * 40
+        except AttributeError:
+            maxWidth = fm.width('m') * 40
         
         self.__closedTabsMenu.clear()
         index = 0