Hi   !
It would probably be best if you posted this question here:
answers.microsoft.com/en-US/windows/forum/windows_10
(also for   Windows 8.1)
Good luck   !

Thanks for quick answer, however it's not helpful. The message has nothing to do with Windows - it is displayed by Firefox. I think I described clearly: I have N version of Windows, it lacks some media features and I don't want Firefox to constantly remind me that. I have attached a screenshot of the message.

Sorry ;   I'm going to call for help.

Duplicate please continue with /questions/1140266

OOPs sorry j4gf3l

I got confused with a couple of links and accidentally closed this as a duplicate. Re-opening the question now

Installing the Media Pack s the obvious solution. Just wondering what reasons you have against doing that.

What media are you using when you see these errors can you give an example of a public site/stream where you see this please ?

I will try to find out more about the info bar or error message and try to see how it can be turned off.

I will give further info later but it appears the pref is

media.decoder-doctor.notifications-allowed

Thank you for your time. It seems that setting the value of the pref "media.decoder-doctor.notifications-allowed" to "none" solved my problem. So far the browser seems to be working OK and no pop up is shown. Once again - thank you.

The example site where pop-up was displayed is Twitter.

Regarding the Media Pack installation - it's just my choice, I try to limit the amount of crap installed on my machine. I don't want Windows Media Player with it's ability "to play DRM content" (I am happy with VLC) and other useless for me apps that come with this pack. I have also removed Silverlight and I am completely fine.

Firefox itself tries to give you the ability to play DRM content, I must admit it is not something I usually need. Thanks for posting back and marking the solution.