Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac=Options)'' ''' key, and then starting Firefox. Is the problem still there? ---------- Separate Issue; Your System Details shows; Installed Plug-ins Adobe PDF Plug-In For Firefox and Netscape "9.4.0" Shockwave Flash 18.0 r0 <br>these programs are out of date.. You must remove the older programs. Then get the current full installer. Flash: Grab the uninstaller from here: '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]''' '''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]''' Then reinstall the latest version. Flash Player '''Version 20.0.0.267<br>https://www.adobe.com/products/flashplayer/distribution3.html''' '''Note: Windows users''' should download the ‘’’active_x’’’ for “Internet Explorer,” '''and''' the ‘’’plugin’’’ for “Plugin-based browsers” (like Firefox). Note: Windows 8 and Windows 10 have built in flash players and Adobe will cause a conflict. Adobe still offers Flash 18.0.0.268 as its extended support release further down Adobe PDF Plug-In For Firefox and Netscape: '''[http://get.adobe.com/reader/ Adobe Reader Version 2015.009.20069]''' '''Note: McAfee Security''' is offered in the download.