-moz- is the Problem here. -webkit- & -ms- are working:
document.body.style[-moz-user-select] = 'none';
https://jsfiddle.net/o2z04sre/1/
Maybe an alternative? Did try it with '-moz-none'
You can use camelcase instead, that seems to work
document.body.style.MozUserSelect = 'none';
FIDDLE
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