There's a message in the list of plugins: Shockwave Flash is known to be vulnerable and should be updated. The plugin version is 16.0.0.305. I clicked update now > plugin check page link on the page that opened and the plugin check page says I need to update Adobe Flash Player. I've tried this several times but the update isn't shown in the Firefox plugins list. It's still listed as Shockwave Flash version 16.0.0.305. The Adobe Flash site confirms the update was successful. Adobe Flash is in protected mode and the option chosen is "Ask to Activate". I searched for a solution to this problem but couldn't find one on Mozilla Support. My Firefox version is 39.0.3 and OS is Windows 10, but the problem was there in the previous Firefox version and with Windows 8.1. Is this maybe caused by insufficient privileges in Windows OS? Any information would be much appreciated.