--- a/browser/components/nsBrowserContentHandler.js
+++ b/browser/components/nsBrowserContentHandler.js
@@ -777,19 +777,17 @@ nsDefaultCommandLineHandler.prototype = 
         var uri = resolveURIInternal(cmdLine, ar);
         urilist.push(uri);
       }
     }
     catch (e) {
       Components.utils.reportError(e);
     }
 
-    count = cmdLine.length;
-
-    for (i = 0; i < count; ++i) {
+    for (let i = 0; i < cmdLine.length; ++i) {
       var curarg = cmdLine.getArgument(i);
       if (curarg.match(/^-/)) {
         Components.utils.reportError("Warning: unrecognized command line flag " + curarg + "\n");
         // To emulate the pre-nsICommandLine behavior, we ignore
         // the argument after an unrecognized flag.
         ++i;
       } else {
         try {