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If Firefox has trouble playing video or music on a Windows computer, you can install the Media Feature Pack, if it's missing. Learn more.

{for mac, linux}{warning}This article applies to Windows users only.{/warning}{/for} Some versions of Windows are missing Windows Media Player and other media-related technologies needed to decode and play videos and music properly (see [http://blog.bitcollectors.com/adam/2013/03/windows-vista-and-7-n-k-kn-special-editions/ this blog post] for details). Microsoft offers a ''Windows Media Feature Pack'' (for versions designated as Windows N and KN editions) and a ''Platform Update Supplement'' (for Windows Vista and Server 2008) that you can download to add this functionality. Here are some problems that people have reported when the Windows Media Feature Pack is missing: *"Why is YouTube video blurry, low resolution, or black?" *"Why do I get Flash instead of HTML video?" *"Why doesn't Vimeo work?" =Solution= To resolve this, please download and install the Media Feature Pack or Platform Update Supplement that's appropriate for your version of Windows: '''Windows 10''': *[https://www.microsoft.com/en-us/download/details.aspx?id=49919 Windows 10: N and KN versions] (Microsoft Support article [https://support.microsoft.com/en-us/kb/3099229 KB3099229]) '''Windows 8.1''': *[http://www.microsoft.com/download/details.aspx?id=42503 Windows 8.1: N and KN versions] (Microsoft Support article [https://support.microsoft.com/en-us/kb/2929699 KB2929699]) '''Windows 8''': *[http://www.microsoft.com/download/details.aspx?id=30685 Windows 8: N and KN versions] (Microsoft Support article [https://support.microsoft.com/en-us/kb/2703761 KB2703761]) '''Windows 7''': *[http://www.microsoft.com/download/details.aspx?id=16546 Windows 7: N and KN versions] (Microsoft Support article [https://support.microsoft.com/en-us/kb/968211 KB968211]) '''Windows Server 2008''': *[https://support.microsoft.com/en-us/kb/2117917 Platform Update Supplement for Windows Server 2008] <!-- L10n: consider using en-us until hang issue for local versions is resolved --> '''Windows Vista''': *[https://support.microsoft.com/en-us/kb/2117917 Platform Update Supplement for Windows Vista] <!-- L10n: consider using en-us until hang issue for local versions is resolved -->