I'm using Windows XP SP3 and xampp and cannot access localhost files using Firefox 26. What I got is 500 Internal Server Error.

After writing localhost address inside address bar and pressing Enter I get the following inside the address bar:


It works fine in Chrome.

Any suggestions as to what might be causing this?


It seems to be a Firefox redirect caused by malware and/or an extension. I suggest you check your extensions and find the smartaddressbar.com redirect. If you can't find such an extension or removing it doesn't solve the issue I suggest running a malware scanner. I recommend:



Additional steps can include checking Add/Remove Programs and find Smart Address Bar. Following this it is suggested you restart Firefox through the troubleshooter menu.


  • Matthew, there is no smartaddresbar in the list of installed addons or plugins. Superantispyware found some critical items and removed them. After restarting the system, problem with Firefox/localhost remains. I noteced, if that matters, when I copy the address from Chrome and want to paste it inside Firefox addressbar (or Paste and Go) - nothing happens. An old address remains inside. Have you any idea, pls? – bonaca Mar 26 '14 at 10:38
  • I have updated my answer to include some other suggestions and a link to a recommendation to remove this hijack. – Matthew Williams Mar 26 '14 at 10:47
  • Matthew, finally solved using reset firefox button. You really helped me so much. Thanks a lot four your patience. – bonaca Mar 26 '14 at 11:34

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