check this: * see if there are updates for your graphics drive drivers '''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration''' * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) '''https://forums.adobe.com/message/4468493#TemporaryWorkaround''' * disable hardware acceleration in the Flash plugin '''https://forums.adobe.com/thread/891337''' See also: * '''http://kb.mozillazine.org/Flash#Troubleshooting''' ---------------------- Separate Issue; Your System Details shows; Installed Plug-ins Adobe Shockwave for Director Netscape plug-in, version 11.6.5.635 Adobe Shockwave for Director Netscape plug-in, version 11.6.6.636 <br>Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer. Adobe PDF Plug-In For Firefox and Netscape: '''[http://get.adobe.com/reader/ Adobe Reader Version 2015.008.20082]''' '''Note: McAfee Security''' is offered in the download.

See also out-of-process plugins: *http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins *https://support.mozilla.org/kb/What+is+plugin-container

The plugin container has been in Firefox for a long time since way back at version [http://website-archive.mozilla.org/www.mozilla.org/firefox_releasenotes/en-US/firefox/3.6.4/releasenotes/ Firefox 3.6.4]