Why doesn't Mozilla allows me to see videos on YouTube in HD, but only auto resolution?

I can see the videos on YouTube to automatic resolution (usually 360 p), other resolutions don't even appear as available for me on Firefox (I don't have this problem in other browsers, but I need Firefox). I have Firefox and Adobe Flash Player up to date, empty cache and memory, but the problem persists. I use Windows XP because it is an old computer with the drivers for newer operating systems compatibility issues.

This problem is already known and is linked to the new HTML5 on YouTube with Windows XP drive.
See previous discussions for more information, for example this answer useful to jscher2000.

Tags: Firefox

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