Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

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

This thread was archived. Əgər kömək lazımdırsa lütfən yeni sual verin.

Why can't I watch video ?

  • 2 cavab
  • 4 have this problem
  • 4 views
  • Last reply by cor-el

Pertinax
Pertinax
more options

I'm using FF 43.0.1 on Windows.

Before I upgraded, videos played without any problem.

Now, when trying to play the top video on this page https://twitter.com/TwitterTips/timelines/581843572464443392 , 

I get the message "This browser does not support video playback."

What's gone wrong ?

How do I resolve the issue, please ?

I'm using FF 43.0.1 on Windows. Before I upgraded, videos played without any problem. Now, when trying to play the top video on this page https://twitter.com/TwitterTips/timelines/581843572464443392 , I get the message "This browser does not support video playback." What's gone wrong ? How do I resolve the issue, please ?

All Replies (2)

guigs
guigs
more options

Please also update the video extensions in your browser:

If you see any issues also see:

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You are probably out of luck with being on Windows XP. XP doesn't support playing MP4 files natively, so Firefox isn't able to play MP4 files via the HTML5 media player.