Crashes or other problems with certain multimedia content in Firefox (such as Youtube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles: * [[Flash Plugin - Keep it up to date and troubleshoot problems]] * [[Flash 11.3 crashes]] * [[Flash 11.3 doesn't load video in Firefox]] On Windows Vista and above, you can disable Flash protected mode by following the instructions on these pages: * http://forums.adobe.com/thread/1018071#TemporaryWorkaround * http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3 (See [http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html this Adobe blog post] for technical details about Flash protected mode.) For recent updates for Adobe Shockwave Flash, please update your version to 14. Please refer to the security updates [http://helpx.adobe.com/security/products/flash-player/apsb14-18.html and Adobe Security Bulletin] for more information. <!--Please also note that html5 may need to be enabled to view some videos on youtube [https://www.youtube.com/html5]--> <!--[version 13]Please refer to these security issues [http://helpx.adobe.com/security/products/flash-player/apsb14-13.html and Adoble Blog post] for more information on the security update. --> Please tell us if this helped!

Your System Details List shows multiple Flash plugins. * 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 You can find the latest Flash player versions for Firefox on this page: *http://www.adobe.com/special/products/flashplayer/fp_distribution3.html