We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Video will not play Error 5 is displayed Fix??? How???

more options

What is the FIX?

What is the FIX?

All Replies (1)

more options

Firefox can't decode MP4 / H.264 video on Windows XP because Microsoft never released the Media Foundation components for XP.

Could you try the workaround in the following thread and let us know how you do:

Firefox will not play videos. Sorry, the video you are trying to see cannot be found. Error 5