Firefox Error ‘No video with supported format and MIME type found’

Users experience the error ‘No video with supported format and MIME type found’ when they try to stream video content on their Firefox browsers. This video can range from Facebook to other platforms such as LiveGo. Recently, Mozilla has followed the trend and removed all plug-ins from the browser in favor of HTML5 with the exception of Adobe Flash which is still widely used and popular.

No video with supported format and MIME type found - Mozilla Firefox
No video with supported format and MIME type found – Mozilla Firefox

We will try various steps to solve this issue ranging from checking the video type to installing Adobe Flash. Before we move to the rest of the article, make sure that you sync your profile first as we will be resetting Mozilla. Also, log in using an administrator account.

Make sure that you the latest version of Firefox installed on your computer beforehand.

What causes the error ‘No video with supported format and MIME type found’ in Firefox?

Since the introduction of HTML5, errors like these are common even in popular browsers like Mozilla. The reasons why this error message occurs when streaming any video are but not limited to:

  • Bad cookies and cache stored in Firefox. Each website fetches cookies and cache when loading content and if they are corrupt or bad, the browser will show errors like the one under discussion.
  • Adobe Flash is not installed on your computer. To this date, there are still numerous websites who make use of Flash.
  • If you have Windows KN and N Edition, the media-related technologies required by Firefox are not installed in them by default. This is how they differ from other Windows editions.
  • There are plug-ins in the browser which may be corrupt or conflicting with the video playing mechanism.

Make sure that you export all your bookmarks and data before proceeding. When we follow the solutions below, your Firefox data might get erased.

Solution 1: Installing Adobe Flash Player

If you do not have Adobe Flash Player installed on your computer, it is recommended that you do right away. Like we mentioned before, there are still numerous websites who make use of Adobe Flash in streaming their videos. If you don’t have the software installed previously, follow the steps mentioned below.

  1. You can download Adobe Flash Player from the official website and select the correct web engine option along with Windows 10/8.
Adobe Flash Player
Adobe Flash Player
  1. After downloading the executable, install it with administrator privileges and restart your computer. Now try accessing the video again.

Solution 2: Clearing Cache and Cookies

There were several users who reported that the cache and cookies were causing issues for them. For example, they can watch the video in Private mode but were not able to do in the normal one. Here we will attempt at clearing your cache and cookies from the browser. This will log you out of all websites and may even forget remembered passwords. Hence export all your bookmarks and data before following this solution.

  1. Open your Firefox client and click on the Menu icon present at the top right side of the screen.
  2. Now select the button Options present somewhere near the bottom of the menu.
  3. Click on Privacy and Security using the left navigation pane.
  4. Click on Clear History and select the option of Everything beside the time range.
Clearing cookies and data - Firefox
Clearing cookies and data – Firefox
  1. Now select Clear data and make sure that everything is selected. Press Clear now if the additional UAC is presented.
  2. Restart your computer properly and try accessing the website which gave you the error message.

Solution 3: Installing Media Feature Pack (for Windows N/KN)

Windows N are versions of the operating system which contain all the base features of Windows but do not have any media player capabilities. People may install this feature but later on, forget that the Media Feature Pack is not built in.

Media Feature Pack (for Windows N/KN)
Media Feature Pack (for Windows N/KN)

To install the Medea Feature pack, navigate to Microsoft’s official website for installing Media Feature Pack for N and KN versions of Windows 10 and download the executables to an accessible location. Install these and restart your computer. Then follow Solution 1 again to install Flash and restart again. Now try accessing the website and see if the error message is resolved.

Solution 4: Reinstalling Firefox

If all the above solutions don’t work, you can attempt at reinstalling Firefox from scratch. Hence make sure that all your bookmarks and data is safely backup in your Mozilla account so we can import them later on.

  1. Press Windows + R, type “appwiz.cpl” in the dialogue box and press Enter.
  2. Once in the application manager, locate the entry of “Mozilla Firefox”, right-click it and select Uninstall.
Uninstalling Mozilla Firefox in Windows 10
Uninstalling Mozilla Firefox
  1. Uninstall all Mozilla products and restart your computer. Now navigate to Mozilla Download site and download the latest version available. After installing, try accessing the online video again and check if the error message is resolved.

Solution 5: Using another browser

If you fail in every way when trying to stream a video, you can make use of other popular browsers out there such as Chrome. Chrome uses the Chromium web engine which is totally different as compared to Firefox with respect to encoding, media capabilities etc. There were numerous cases where users were able to stream videos on Chrome as compared to Firefox.

Downloading Google Chrome in Windows 10
Downloading Google Chrome

Navigate to Chrome download website and save the executable to an accessible location. Now install Chrome and try accessing the website video in it. Hopefully, there will not be any issue.

If the video is inaccessible on several browsers and other devices as well, it probably means that there is something wrong at the server side. Here you can lodge a complaint with the website owner and wait until it gets fixed.


Kevin Arrows

Kevin Arrows is a highly experienced and knowledgeable technology specialist with over a decade of industry experience. He holds a Microsoft Certified Technology Specialist (MCTS) certification and has a deep passion for staying up-to-date on the latest tech developments. Kevin has written extensively on a wide range of tech-related topics, showcasing his expertise and knowledge in areas such as software development, cybersecurity, and cloud computing. His contributions to the tech field have been widely recognized and respected by his peers, and he is highly regarded for his ability to explain complex technical concepts in a clear and concise manner.