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.

[tequila97]

We really need mkv support with hvec. C'mon it's 2024 already

[windows2000]

Honestly ridiculous. I want to play MKV videos in my browser for language-learning reasons but I cannot because firefox refuses to support it! I don't want to have to download a bloated chromium browser just to play mkv files...

[myspace]

+1 please I don't want to have to use chrome. thank you!

[ittixen]

As a dev building localhost web apps that browse and display files, MKV is one of the most common video files I encounter and that just makes my entire projects inviable to develop in Firefox. A weird insistence to keep one of the most popular formats out.

[CocolinoFan]

+1 bump.

[greenvorbisfan]

+1

[xylem]

It's unfortunate that after seven years, this feature is still missing, ultimately pushing more and more users toward Chromium-based browsers. Firefox really needs to prioritize adding this functionality.

[PabloGirol]

+1