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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 . Then you can play the video in a media player that supports the video format. If the videos still aren't playing in Firefox with the NoPlugin add-on, . Among the file formats that Flash uses are the following: l F4A. An audio format for the Flash Player with the audio/mp4 MIME type. l F4B. An audio book format . These formats tend to be more complex and may mix media and involve rich . The browser knows which player to use based either on the browser's MIME table . This is not about the Flash plugin but about the HTML5 media player that can't play any of the media formats that the website offers. See: https:// . 'No video with supported format and MIME type found' issue . Flash Player, try to play videos with the default Firefox player (any video on the . This article lists all file, streaming, and playlist formats officially supported by JW Player 8. MIME type stands for multipurpose internet mail extensions and is a format for a video file that is transmitted across the internet. MIME types . . video when unreproducible, or; use another player as a fallback, or; convert your videos, or; whatever. Also read Mozilla's article on supported media formats.