Mozilla will shut down Pocket’s services on July 8, 2025. At that time users will no longer be able to access the Pocket website, apps and API. You can export your saved items and API data until October 8, 2025 before they are permanently removed. For more information, see this article.

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I have .mp4, .m4v, and .mkv videos, all with embedded subtitles that I can see in VLC. How can I see the subtitles in Firefox?

I have .mp4, .m4v, and .mkv videos, all with embedded subtitles that I can see in VLC.

How can I see the subtitles in Firefox? For now, subtitles are in both French and English.

I have .mp4, .m4v, and .mkv videos, all with embedded subtitles that I can see in VLC. How can I see the subtitles in Firefox? For now, subtitles are in both French and English.

All Replies (5)

It is embedded in the video

That is why I can see the subtitles when I open the video file with VLC. When I put the files on my website and open them from Firefox, I get audio and video and NOT subtitles, and I have found no controls to allow me to see the subtitles.

hello,

follow the link:

[https://bugzilla.mozilla.org/show_bug.cgi?id=955901]

tell me when resolved your problem.

Thank you

Not resolved.

Using Win10 1909 (2) Firefox 77.0.1 (64-bit)

On my website, I created and copied: filename.m4v filename.eng.srt filename.eng.vtt filename.fre.srt filename.fre.vtt

an then tried to play "filename.m4v" - video and audio played - no subtitles

Hi walt.morrey, I don't have any personal experience with this kind of configuration, but there is an article on the MDN site that might help you set up your <video> tags in a way that Firefox will understand:

https://developer.mozilla.org/docs/Web/Guide/Audio_and_video_delivery/Adding_captions_and_subtitles_to_HTML5_video