User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20151030084315 Steps to reproduce: Although Version 42 notes said both should be enabled, they aren't in two computers with Ubuntu I have tested. Actual results: Youtube videos play in Flash, and if you enable HTML5 its poor and only in 360p and 720p . Expected results: They should be enabled, in About:Config if you enable both of them they works excellent.
Component: Untriaged → General
OS: Unspecified → Linux
Hardware: Unspecified → x86_64
I also see media.mediasource.enabled -> false in Firefox 42, using the firefox package in Ubuntu 15.10 64-bit. Videos were playing in 360p instead of 4K.
It's enabled in 43. If you still only get 360p, blame YouTube.
Status: UNCONFIRMED → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1233970
Note that if you change the user agent to report version 44 everything will work as you expect.
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