diff --git a/browser/components/sessionstore/src/nsSessionStore.js b/browser/components/sessionstore/src/nsSessionStore.js
index 5066f00e93a..9532fcfeb02 100644
--- a/browser/components/sessionstore/src/nsSessionStore.js
+++ b/browser/components/sessionstore/src/nsSessionStore.js
@@ -1065,6 +1065,14 @@ SessionStoreService.prototype = {
       if (length > maxTabsUndo)
         this._windows[aWindow.__SSi]._closedTabs.splice(maxTabsUndo, length - maxTabsUndo);
     }
+
+    // Remove the tab from the saved window state if it matches what is already
+    // there. This solves bug 677424
+    if (aTab._tPos < this._windows[aWindow.__SSi].tabs.length) {
+      var oldTab = this._windows[aWindow.__SSi].tabs[aTab._tPos];
+      if (oldTab.entries[oldTab.index - 1].url == aTab.linkedBrowser.currentURI.spec)
+        this._windows[aWindow.__SSi].tabs.splice(aTab._tPos, 1);
+    }
   },
 
   /**