How can I fix Dark Theme / FireFox 56 when using PolicyPak?

Cause:
It seems the Firefox set the following settings in about:config

how-can-i-fix-dark-theme-firefox-56-when-using-policypak-0

We are unable to verify if it’s set by us or Firefox itself. We need more time to investigate.

Resolution:
In our lab, problem goes away when we set the settings as shown in this screenshot:

how-can-i-fix-dark-theme-firefox-56-when-using-policypak-1

lightweightThemes.SelectedThemeID = empty
lightweightThemes.usedThemes = true

To fix this on all your client machines please use Firefox Abou:Config PAKs and set the above value as instructed. Here is just a reference screenshot:

how-can-i-fix-dark-theme-firefox-56-when-using-policypak-2

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