--- a/browser/base/content/browser-places.js
+++ b/browser/base/content/browser-places.js
@@ -1515,16 +1515,17 @@ var LibraryUI = {
         "toolkit.cosmeticAnimations.enabled", true);
     }
 
     let libraryButton = document.getElementById("library-button");
     if (!libraryButton ||
         libraryButton.getAttribute("cui-areatype") == "menu-panel" ||
         libraryButton.getAttribute("overflowedItem") == "true" ||
         !libraryButton.closest("#nav-bar") ||
+        !window.toolbar.visible ||
         !this.COSMETIC_ANIMATIONS_ENABLED) {
       return;
     }
 
     let animatableBox = document.getElementById("library-animatable-box");
     let navBar = document.getElementById("nav-bar");
     let libraryIcon = document.getAnonymousElementByAttribute(libraryButton, "class", "toolbarbutton-icon");
     let dwu = window.getInterface(Ci.nsIDOMWindowUtils);