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.

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

Firefox will not play some videos, with the message: "We cannot play the video in this browser. Please try a different web browser". How do I fix this?

  • 6 replies
  • 1 has this problem
  • 5 views
  • Last reply by James

more options

I see this with videos on twitter.com. There is nothing on the video to click on to figure out what kind of video it is. This is on Fedora Linux: I have the Open H264 and Flash plugins installed. Many other videos (e.g., youtube) play ok.

(I've attempted to upload a screenshot with this, but it won't upload.)

I see this with videos on twitter.com. There is nothing on the video to click on to figure out what kind of video it is. This is on Fedora Linux: I have the Open H264 and Flash plugins installed. Many other videos (e.g., youtube) play ok. (I've attempted to upload a screenshot with this, but it won't upload.)

All Replies (6)

more options

Here is a screenshot.

more options

Are you able to play HTML5 player videos in general?

This page can show if you fully support the HTML5 player on Youtube for example as all check marks should ideally be blue. https://www.youtube.com/html5/

If you have two or more red checks then you may be missing packages like not having FFmpeg installed in package manager on your Linux distro.

more options

Please provide public link(s) (no password) that we can check out. No Personal Information Please !

Make sure you are not blocking content.

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

more options

FredMcD, the OP and image mentions the site. Basically videos posted on Twitter that uses the HTML5 player.

more options

And how does one check out the web pages without their addresses?

more options

I take it you do not use Twitter. This is the tweet that is in image. https://twitter.com/KeeblerElves/status/973181819771412482