Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Buscar en Ayuda

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

Play MP4 video

  • 4 respuestas
  • 2 tienen este problema
  • 1 visita
  • Última respuesta de bneri001

more options

How do I reset the settings so I can play MPeg4 videos in the browser without a dialog box asking to download it? I've tried going under Settings but it won't let me select "Open in FireFox."

How do I reset the settings so I can play MPeg4 videos in the browser without a dialog box asking to download it? I've tried going under Settings but it won't let me select "Open in FireFox."

Todas las respuestas (4)

more options

Could be about the media.play-stand-alone pref on the about:config page in case you modified it in the past.

You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".

more options

I tried typing About: Config in the address bar and nothing came up

more options

No space. Type about:config<enter> in the address box.

more options

Its set at True. Is that the right setting or could it be something else?