Please update to the most recent version of Firefox: *[[Update Firefox to the latest version]] In order to troubleshoot further, we might need a little more information. For example, do you have an example url where this happens? Is it greyed out where it does not function? *[[What to do if Firefox won't play any sounds]]

A greyed out button normally means that option is not available. check this: * see if there are updates for your graphics drive drivers '''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration''' * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) '''https://forums.adobe.com/message/4468493#TemporaryWorkaround''' * disable hardware acceleration in the Flash plugin '''https://forums.adobe.com/thread/891337''' See also: * '''http://kb.mozillazine.org/Flash#Troubleshooting'''