You show 2 Flash plugins as being available for Firefox. Shockwave Flash 20.0 r0 Shockwave Flash 19.0 r0 Not good. --------------- First, grab the Adobe uninstaller from here: http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Then download the latest Flash Plugin version from here: Select the Windows > ''Plugin-based browsers'' - the EXE version. https://www.adobe.com/products/flashplayer/distribution3.html Run the Flash uninstaller program, then reboot your PC. Then install the Plugin version of Flash. So you'll have a clean installation of Flash for Firefox.