You have to enable NTLM using the following steps, so that Firefox will authenticate automatically.

1. Open Firefox
2. Type about:config in the address bar and hit Enter.
3. Type network.automatic in the top Filter bar
4. Right click network.automatic-ntlm-auth.trusted-uris and click Modify
5. Enter only the names of your internal(SharePoint) servers in a comma-delimited list. For example: lon-ad-01,contoso and click OK.
6. Restart Firefox

You should be able to access all of your SharePoint sites on the servers you entered through Firefox now without providing credentials repeatedly.

The above setting is usually stored in " prefs.js " in the following directory:

C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Profiles\<uniqueid>.default

private static void Traverse(string top, string from, string to)

{

             SPSite topSite;

             SPWebCollection subSites;

            try

            {

                topSite = new SPSite(top);

                subSites = topSite.AllWebs;

                foreach (SPWeb web in subSites)

                {

                    using (web)

                    {

                        Console.WriteLine("******** STARTING " + web.Name.ToString() + "************");

                        SPNavigationNodeCollection nodes = web.Navigation.QuickLaunch;

                        foreach (SPNavigationNode node in nodes)

                        {

                            UpdateURL(node, from, to);

                            SPNavigationNodeCollection childNodes = node.Children;

                            foreach (SPNavigationNode cNode in childNodes)

                            {

                                UpdateURL(cNode, from, to);

                            }

                        }

                        Console.WriteLine("******** CLOSING " + web.Name.ToString() + "************");

                    }

                }

              //  Console.ReadLine();

            }

            catch (Exception exp)

            {

                Console.WriteLine(exp.Message + " :: " + exp.StackTrace.ToString());

            }

        }

        private static void UpdateURL(SPNavigationNode cNode, string from, string to)

        {

            if (cNode.Url.IndexOf(from) > 0)

            {

                Console.WriteLine("FOUND CULPRIT -> " + cNode.Title.ToString() + 

             " :: " + cNode.Url.ToString());

                cNode.Url = cNode.Url.ToString().Replace(from, to);

                cNode.Update();

                Console.WriteLine(cNode.Title.ToString() + " :: " + cNode.Url.ToString());

            }

        }