On Tue, Apr 05, 2016 at 01:39:18PM -0500, Ranjan Maitra wrote: > Actually, I see this warning all the time also, especially when > youtube video is embedded. The video does play on youtube.com > however, > > $ rpm -qa flash-plugin > flash-plugin-11.2.202.577-release.x86_64 Did you update using yum/dnf while Firefox was running? If so, you're probably hitting this: http://unix.stackexchange.com/q/174210/2511 Short version: 1. exit firefox 2. rm ~/.mozilla/firefox/*/pluginreg.dat 3. start firefox again -- Matthew Miller <mattdm@xxxxxxxxxxxxxxxxx> Fedora Project Leader -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: http://lists.fedoraproject.org/admin/lists/users@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org