If specific websites (not all) start to load, but never finish (i.e. The Firefox activity indicator may spin for several minutes, or the status bar may show "Done" on a blank page), it is either because of a software trojan called Vundo, or a file being in the wrong format.

Cuprins

• Vundo trojan variant
• Search for malware
• More help
• JavaScript file format

Vundo trojan variant

A variant of the Vundo trojan is known to cause Firefox to have problems loading certain high-traffic sites, including Google, Yahoo, MySpace, Facebook, and more.

Search for malware

Not all variants of the Vundo trojan can be detected or removed by malware scanners. However, you should scan your computer for infections first:

• Run the Microsoft Malicious Software Removal Tool.
• Run a full system virus scan with something other than your normal program:
  • A free solution online is Kaspersky's online scanner.
• Run a full system spyware scan with something other than your normal program:
  • MalwareBytes' Anti-Malware
  • SUPERAntiSpyware is known to detect many variants of Vundo, and has a free version.
  • Spybot S&D is a well-known free solution.

More help

If you're having a problem loading sites other than the one described above, see the Error loading web sites article to see if it addresses your problem. You can also check your Internet security software - resetting permissions for Firefox can often fix similar problems.

There can be other causes of the symptoms described above. Before attempting these instructions, try the methods described in the Basic troubleshooting article to see if they will address your problem.

If you still have problems after scanning, you may ask a support question.

There are also specialized forums for malware removal such as those listed below, where you might be able to get more help:

• Bleeping Computer Forums
• Safer Networking Forums
• Spyware Warrior Forums
• SWI Forums

JavaScript file format

In rare cases, a web page may be using an external JavaScript file which is in the wrong format. Try disabling JavaScript - see JavaScript. If the page now finishes loading the bad Javascript file may be coming from:

• a proxy filter that is incorrectly filtering that website's files. If you are running a proxy filter such as Privoxy, try disabling it.
• the server. Contact the site administrator for that website.