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I am using Firefox ESR 52.9.0 on XP and most HTML5 video i.e. on youtube doen not work, should I pass on a non ESR version?
There is no true reason for which I am using an ESR version I could use another but in this moment I have to remain on XP on this PC. So is there a Firefox version that can display the HTML 5 video on a WIN XP PRO SP3?
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Firefox relies on built-in OS support to play media files via the HTML5 media player. On the Windows XP platform you do not have native support for playing MP4 files with the HTML5 media player.
You can try if the solution posted here to add support for playing MP4 files works for you.