If you are trying to play a video in the Firefox browser but receive a Video format or MIME type is not supported error message on the player, these solutions are likely to help. This problem occurs when your browser lacks certain functionality required to play that video.
Video format or MIME type is not supported in Firefox
- Install, re-install Adobe Flash Player
- Enable JavaScript in the browser
1] Install or re-install Adobe Flash Player
Adobe Flash Player is the primary thing you need to play such a video. Although you may be able to play similar videos without installing the Adobe Flash Player, you need to install that if you get such an error message. To install it, visit the official adobe.com website.
If you already have it installed on your computer, you can try uninstalling and then re-installing it.
2] Enable JavaScript in the browser
Many website admins use JavaScript to display the player on their web pages. If you have disabled JavaScript in your Firefox browser, you will likely get this error message. Therefore, the simple solution is to enable JavaScript.
To do so, enter this in the address bar and hit the Enter button:
about:config
You need to click the I accept the risk button to go further. After that, look for:
javascript.enabled
If the Value is set to False, double-click it to make it True. After that, reload the page and check if you can play the video or not.
Other things you could try are disabling all the add-ons, clearing the web cache, and updating your browser, and seeing if that helps.
