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 Shockwave Flash 20.0 r0 Shockwave Flash 18.0 r0 <br>Having more than one version of a program may cause issues. 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 Version: 20.0.0.306<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. Install the '''plugin''' only. '''Not''' the '''active_x.''' Adobe still offers Flash 18.0.0.326 as its extended support release further down