There are a few things you can try here: '''Check Security software''' Ensure that your security software (anti-virus, firewall, etc.) is configured to fully allow Firefox to access the Internet. [[Configure firewalls so that Firefox can access the Internet]] and [[Fix problems connecting to websites after updating Firefox]]. '''Update your Graphics Driver''' An out of date graphics drive can cause weird issues and slowness. [[Upgrade your graphics drivers to use hardware acceleration and WebGL]] '''Scan for Malware''' 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 some of the following programs to scan for malware: * [http://www.malwarebytes.org/mbam.php MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://windows.microsoft.com/MSE Microsoft Security Essentials] (A good permanent anti-virus if you don't already have one) Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. '''Update your plugins''' Out of Date plugins are not only a security risk, they cause stability problems in Firefox. [https://www.mozilla.org/en-US/plugincheck/ https://www.mozilla.org/en-US/plugincheck/] '''Reset Firefox''' If the above doesn't help, try to Reset Firefox. [[Reset Firefox – easily fix most problems]]

You can also check for problems caused by recent Flash updates and try these: *disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed *disable protected mode in Flash 11.3 and later *disable hardware acceleration in the Flash plugin *downgrade the Flash player to version 10.3 or 11.2 *http://kb.mozillazine.org/Flash#Troubleshooting