I believe it’s some time in this year, the HD quality options, that’s 720p and 1080p, were missing, and not only those, actually I only got 360p of all options.
Currently, as of 2015-12-05, I am using Firefox ESR 38.4.0. In fact, I have found the solution much earlier — even though this official YouTube Help gives absolutely zero help at all — but never bothered writing it, but now I have decided to write a post.
From what I can check with about:config.
If I turn on:
- media.fragmented-mp4.exposed
- media.fragmented-mp4.ffmpeg.enabled
I will get 720p HD with video/mp4; codecs="avc1.64001F, mp4a.40.2". That’s just 360p and 720p for now.
If I also turn on:
- media.mediasource.enabled
I will also get 1080p HD, 144p, 240p, and 480p. The 720p is video/mp4; codecs="avc1.4d401f". Now it’s the full set as before.
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