Youtube playlists will not autoplay using Firefox version 32 in normal or safe mode

I'm currently using Firefox version 32.0.2.
Recently, playlists on Youtube have ceased autoplaying (and yes, I've made sure that the icon for autoplay is enabled). This persists even with addons disabled in safe mode.
I've tested Chrome and Internet Explorer on the same PC with the same youtube playlists and cannot recreate the problem.

Type '''about:preferences''' in the address bar and press '''Enter.'''
Select '''Advanced > General.'''
Is '''Warn me when websites try to redirect or reload the page''' turned off?

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Youtube playlists will not autoplay using Firefox version 32 in normal or safe mode

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