Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. You can try these free programs to scan for malware, which work with your existing antivirus software: * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] [http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!

Make sure that you have the latest Java version (7 update 25). Update the Java plugin to the latest version. *https://support.mozilla.org/kb/Using+the+Java+plugin+with+Firefox *http://kb.mozillazine.org/Java You can find the latest Java version on the Oracle website. See Java Platform > Java SE 7U21/6U45 (JRE Download) *http://www.oracle.com/technetwork/java/javase/downloads/index.html *http://java.com/en/download/manual.jsp