For a technical overview of the features of the Windows Media codecs, see About the Windows Media Codecs.
The data reveals that WMP users are so loyal that they would rather download media player codec pack for Windows 10, 8.1, 7, XP, etc to make up for incompatible codecs and perfect the Player software.
The preferred mime type for the Firefox browser is application/x-ms-wmp, however, there are several other mime types that you can use to embed the Player control in a webpage hosted by the Firefox browser.
The fourth column of the table shows the attributes that are supported when you use a mime type other than application/x-ms-wmp.
The Windows Media Audio and Video codecs are a collection of objects that you can use to compress and decompress digital media data.
Each codec consists of two objects, an encoder and a decoder.