Public bug reported:

In Mozilla Firefox, Google Chrome and Chromium (probably HTML5 based) video and 
audio playback is broken.
Vimeo: Video has no sound, runs too fast or hangs
Youtube: Video has no sound, runs too fast or hangs
Amazon: MP3 Previews not working anymore (no sound but time display correct)

System sound is working fine in all other places.
Behavior is the same when using a new user account.

When all these services where flash based, no issues where observed.
A long search around found no reason so far.

Suspect might be a video codec/decoder issue?

Description:    Ubuntu 14.04.1 LTS
Release:        14.04

firefox:
  Installed: 35.0+build3-0ubuntu0.14.04.2
  Candidate: 35.0+build3-0ubuntu0.14.04.2
  Version table:
 *** 35.0+build3-0ubuntu0.14.04.2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     28.0+build2-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1412700

Title:
  YouTube Vimeo Amazon Playback broken

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