Try this: *Download the full Firefox installer and save the file to the desktop<br>https://www.mozilla.org/en-US/firefox/all/ *Start the installation with a double-click on the desktop icon ---- Note that your System Details List shows multiple outdated Flash plugins (current is 16.0.0.235). *Shockwave Flash 15.0 r0 *Shockwave Flash 13.0 r0 You can find the installation path of all plugins on the <b>about:plugins</b> page. *http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins You can check the Flash player installation folder for multiple Flash player plugins and remove older version(s) of the plugin (NPSWF32) and possibly (re)install the latest Flash player. *(32 bit Windows) C:\Windows\System32\Macromed\Flash\ *(64 bit Windows) C:\Windows\SysWOW64\Macromed\Flash\ You can uninstall the current Flash player version and (re)install the latest Flash version. See this about uninstalling Flash players: *http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Note that this will remove all installed Flash players. You can find the latest Flash player versions for Firefox on this page: *http://www.adobe.com/special/products/flashplayer/fp_distribution3.html