widget.content.gtk-theme-override

If this policy is enabled, the preference is locked to the string entered. If this policy is disabled, it has no effect.

For a description of the preference, see:

https://github.com/mozilla/policy-templates/blob/master/README.md#preferences

Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry Path	Software\Policies\Mozilla\Firefox\Preferences
Value Name	widget.content.gtk-theme-override
Value Type	REG_SZ
Default Value