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
<mat...@fedoraproject.org>
Fedora Project Leader
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