Youtube doesn’t work anymore in firefox (Ubuntu 14.04)

Title says it all. Whenever I try to play a Youtube video I get the error messages:

Your browser does not recognize any of the video formats available

It worked fine just before I installed the pipelight plugin. I am very confused and annoyed at this. My Youtube still works fine in chrome.

Any help is appreciated.

Answer

Install the ubuntu-restricted-extras package:

sudo apt-get install ubuntu-restricted-extras

From Wikipedia:

Ubuntu Restricted Extras is a software package for the computer
operating system Ubuntu that allows the user to install essential
software which is not already included due to legal or copyright
reasons.

It is a meta-package that installs:

  • Support for MP3 and unencrypted DVD playback
  • Microsoft TrueType core fonts
  • Adobe Flash plugin
  • codecs for common audio and video files

Attribution
Source : Link , Question Author : Muggi , Answer Author : Eliah Kagan

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