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!

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

I have installed media feature pack but still h264 etc. don't work in firefox. Why can't I play some video in Firefox?

  • 1 reply
  • 4 have this problem
  • 4 views
  • Last reply by Shadow110

per2per
per2per
more options

Can't use Twitch, twitter videos and some videos on youtube right after a livestream. I get that "to enhanced video quality install microsoft media pack" or something like that, but I already have. I get that youtube error list showing red on h.264 and some other format also.

Can't use Twitch, twitter videos and some videos on youtube right after a livestream. I get that "to enhanced video quality install microsoft media pack" or something like that, but I already have. I get that youtube error list showing red on h.264 and some other format also.

All Replies (1)

Shadow110
Shadow110
more options

Uninstall and download Full Version 56.0.1 Installer from here : https://www.mozilla.org/en-US/firefox/all/

Check your Flash to see if running Flash Player Version: 27.0.0.170

Please let us know if this solved your issue or if need further assistance.