Add support for Matroska Media Container (.mkv files)

[Steeltent]

The Bugzilla entry is five years old. Chrome can do this. It's annoying that Firefox can not.

Not being able to play .mkv files makes it impractical for some people to use Firefox. They need this feature to play videos from Plex or Jellyfin and to monitor their security cameras. These are just two examples of very common use cases. And in such cases users are forced to use a Chromium-based browser. They simply have no other choice.

That's why I think Firefox should add this feature as soon as possible.  

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[Szwendacz]

I just found out that FF does not support mkv, so i cannot play mkv videos in Nextcloud.

[okay_okay]

+1 

[Mokacchi]

+1

[Mokacchi]

+1, I want to use a popular japanese study website which can play local video files with japanese subtitles, but it simply does not work on Firefox since my files are in mkv containers.

[teledyn]

I just spent a morning trying to figure out why my Nextcloud MKV files all returned errors on Firefox but not on Chrome. How is it even possible? FF is intentionally blocking? If that is true, then frankly my dear Mozilla, it is not an 'error' it is 'censorship' and therefore please change your error message.  Mozilla is supposed to be the 'honest' one.

Yes, I know, no one from Mozilla is going to read that, but it felt good to say it.