--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -724,16 +724,17 @@
                          aStateFlags & nsIWebProgressListener.STATE_IS_NETWORK) {
 
                 if (this.mTab.hasAttribute("busy")) {
                   this.mTab.removeAttribute("busy");
 
                   // Only animate the "burst" indicating the page has loaded if
                   // the top-level page is the one that finished loading.
                   if (aWebProgress.isTopLevel && !aWebProgress.isLoadingDocument &&
+                      Components.isSuccessCode(aStatus) &&
                       !this.mTabBrowser.tabAnimationsInProgress &&
                       Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled")) {
                     this.mTab.setAttribute("bursting", "true");
                   }
 
                   this.mTabBrowser._tabAttrModified(this.mTab, ["busy"]);
                   if (!this.mTab.selected)
                     this.mTab.setAttribute("unread", "true");