Leap 15.5, Tumbleweed 64b.: malformed sound in palemoon on http://www.freeintertv.com

Malformed sound in palemoon on http://www.freeintertv.com/view/id-3335/Germany-1-0-1

Malformation seems to be caused by slowing down the speed of playing the sound.

No problem in other Linux distros or Windows.

Palemoon 64b. downloaded from https://www.palemoon.org/

Any idea pls ?

EDIT: happens on Arch linux too: https://forum.palemoon.org/viewtopic.php?p=245541#p245541

Changing *User Agent Mode* from *Gecko* to *Firefox* solved the problem in openSUSE Leap.

(as suggested here https://forum.palemoon.org/viewtopic.php?p=245535#p245535)