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.  

[probablywrong]

Truly wild that this still has not been added. I have to keep a Chromium browser on my computer specifically because of this. That's probably the biggest failing of any browser is to say "well it simply cannot do this thing so I have to keep another browser."

[probablywrong]

Extra bump.

[Tribhoon]

+1

[nicht]

+1 for this, mkv is a common format and needs to be supported!

[tgbh2o]

+1

[jasondaigo]

i just discovered this is still not implemented. you cant be serious

[Parsijn]

I would love for this to be implemented as well! 

[Stalker-Jora]

Using nextcloud during work and don't want to return to the Chrome, so needed ability to play .mkv in the built-in FF player 😼

[ludwig480]

Definitely necessary