No video with supported format and MIME type found

No video with supported format and MIME type found

This error message is very common among Mozilla Firefox web browser users.

You will be denied access to your favorite video if “No video with supported format and MIME type found” keeps showing up in place of your supposed video.

So make sure you read between the lines so you know what this means, why you got that message, and how to get rid of it and get back to viewing.

I was excited about watching one of my favorite videos only to get a message that reads “No video with supported format and MIME type found” and I was like, mehn!

What the heck!

You will only have this message if you are trying to watch an online video may be on Facebook, Twitter, Youtube, and the likes.

Firefox has also been following the trend in favor of HTML5 to remove all plugin-ins from their web browser.

Though Adobe flash player still remains popular and exempted from this.

To fix this problem, we’ll be running through some steps that would help you fix this error without going any further.

The video type you were trying to watch could contribute to this error so you might want to be sure the video was uploaded in a supported format.

Also, check to be sure that your Adobe Flash is correctly installed on the web browser.

If all of these are checked and in good standing but you still have the error message “no video with supported format and MIME type found” then you might want to synchronize your browser as we proceed.

We’ll be resetting our Firefox as we proceed, this is why you need to sync your profile and also be sure that you are signing in as an administrator.

Possible causes of “No video with supported format and MIME type found” in Mozilla

This error became very common among Firefox users since the introduction of HTML5.

Here is a list of the possible cause of this error.

Though not limited to the list below:

  • Absent of Adobe Flash
  • Bad cache and cookies on your web browser

By taking care of these possible causes, you must have provided a solution to the problem; already.

Before you proceed, please backup your browser data as we may lose some of them in the course of fixing this error.

Here are the possible solutions

1. Install Adobe Flash player

You must install Adobe flash player to get things working again.

If you have it already installed, then you might want to be sure that it is installed correctly.

The majority of video sharing sites require Adobe Flash Player to be able to stream their videos so its absence from your web browser may leave you with this error message each time you try to stream.

If you don’t have it installed on your browser already, you can simply head over to the Adobe Flash Player website to and select the version that suits your operating system.

Download, install, restart your computer and try watching the video again and see if it works.

2. Cache and cookies

One of the little known solutions to this problem can be as easy as clearing your browser cache and cookies.

A typical way to check if it is your browser cache or cookies that are preventing you from watching your favorite online video is to try watching the video in incognito mode.

There have been a lot of users who were able to watch the video in a private mode but not on the normal browsing mode.

If this is the case with you, all you need to do is to simply clear the browser cookies and cache and get back to viewing.

You may lose some of the data in your browser after clearing the cache and cookies so be sure you export your data to a safe place.

I believe you know how to clear your browser cache and cookies?

If not, follow the steps below:

  • Tap on the hamburger icon at the top right corner of your Firefox browser
  • Tap options
  • Then on the left vertical menu, select “Privacy & Settings”
  • There you can clear your cached web content and remove individual cookies
  • Restart your PC to be sure the change you’ve made is effected.

These are the things that can prompt your online video to tell you that there is no video with a supported format.

If after trying all these your normal viewing is not still restored, then you might want to continue with another browser.

But if it must be Mozilla, then you can simply reinstall your Firefox to be sure that you are getting the latest version of the browser which will come with all the online video streaming mechanisms.

I hope this helps!

Feel free to leave a message if in doubt.