You have to versions of flash, I suggest before anything you uninstall and reinstall Flash. If that does not work attempt to start Firefox in safe mode. https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Next if problem is still not solved attempt a refresh. https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Having more than one version of a program may cause issues. 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 17.0.0.169<br>https://www.adobe.com/products/flashplayer/distribution3.html''' -------------------------------- 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?