--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -488,16 +488,21 @@ toolbar:not(#TabsToolbar) > #personal-bo
 /* The reload-button is only disabled temporarily when it becomes visible
    to prevent users from accidentally clicking it. We don't however need
    to show this disabled state, as the flicker that it generates is short
    enough to be visible but not long enough to explain anything to users. */
 #reload-button[disabled]:not(:-moz-window-inactive) > .toolbarbutton-icon {
   opacity: 1 !important;
 }
 
+/* Ensure stop-button and reload-button are displayed correctly when in the overflow menu */
+.widget-overflow-list > #stop-reload-button > .toolbarbutton-1 {
+  -moz-box-flex: 1;
+}
+
 #PanelUI-feeds > .feed-toolbarbutton:-moz-locale-dir(rtl) {
   direction: rtl;
 }
 
 #appMenu_historyMenu > .bookmark-item,
 #appMenu-library-recentlyClosedTabs > .panel-subview-body > .bookmark-item,
 #appMenu-library-recentlyClosedWindows > .panel-subview-body > .bookmark-item,
 #panelMenu_bookmarksMenu > .bookmark-item {