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. Please ask a new question if you need help.

Playing MP4 Videos

  • 1 reply
  • 3 have this problem
  • 10 views
  • Last reply by cor-el

adrian.e.morton
adrian.e.morton
more options

My Browser has stopped playing MP4 Videos,giving the message NO VIDEO WITH SUPPORTED FORMAT AND MIME TYPE FOUND

My Browser has stopped playing MP4 Videos,giving the message NO VIDEO WITH SUPPORTED FORMAT AND MIME TYPE FOUND

All Replies (1)

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

Does the Web Console or Browser Console give more info ?