--- a/toolkit/components/places/src/nsPlacesDBFlush.js
+++ b/toolkit/components/places/src/nsPlacesDBFlush.js
@@ -197,31 +197,35 @@ nsPlacesDBFlush.prototype = {
 
     let statements = [];
     for (let i = 0; i < aTableNames.length; i++)
       statements.push(this._getSyncTableStatement(aTableNames[i]));
 
     // Execute sync statements async in a transaction
     // XXX due to a bug in sqlite, we cannot wrap these in a transaction.  See
     //     https://bugzilla.mozilla.org/show_bug.cgi?id=462379#c2 for details.
-    //this._db.executeAsync(statements, statements.length, this);
+    this._db.executeAsync(statements, statements.length, this);
+
+    // XXX Disabled due to persistent test failures on the tinderbox.
+    /*
     let self = this;
     let listener = {
       // We also need to batch the two handleCompletion objects into one.
       _count: 0,
       handleError: function(aError) self.handleError(aError),
       handleCompletion: function(aReason) {
         this._count++;
         if (this._count == 2) {
           // we have gotten both notifications
           self.handleCompletion(aReason);
         }
       }
     };
     statements.forEach(function(stmt) stmt.executeAsync(listener));
+    */
 
     // Finalize statements, otherwise we could get in trouble
     statements.forEach(function(stmt) stmt.finalize());
   },
 
   /**
    * Generate the statement to synchronizes the moz_{aTableName} and
    * moz_{aTableName}_temp by copying all the data from the temporary table