I upgraded Kubuntu 14.04-x64 to 14.10. Now flash does not work in Firefox. Now flash is an empty area which sometimes is black when cursor is under it.
But flash still works in Chromium.
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Adobe flash player version is not updated for Ubuntu from version 11.2. So many websites notify to update flash player and some websites with not working issues. Try the flash player in this link http://www.webupd8.org/2014/05/install-fresh-player-plugin-in-ubuntu.html