Hi,
On testing, libavcodec58 arrived and libavcodec57 has been removed.
Unfortunately Firefox 52 is not compatible with libavcodec58 and needs
libavcodec57 to decode H264. Thus, you cannot play h264 anymore.
The solution is to manually install libavcodec57 from Debian stable or
to upgrade to
Package: firefox-esr
Version: 52.9.0esr-1
Severity: important
Things like arte mediathek and stuff fails videoplayback.
Also output of youtube.com/html5 states that H264 Playback does not work.
Same firefox version in Stretch had this problem not.
-- Package-specific info:
-- Extensions
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