Pretty sure this is bug 1588199. I do see that remote strings for "ar" did not have at least `cfr-doorhanger-socialtracking-heading` so it would prevent showing of that panel. Simona, can you check if things are nightly 71.0a1 20191016095255 or newer?
Bug 1588079 Comment 4 Edit History
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Pretty sure this is bug 1588199. I do see that remote strings for "ar" did not have at least `cfr-doorhanger-socialtracking-heading` so it would prevent showing of that panel. Simona, can you check if things are fixed in nightly 71.0a1 20191016095255 or newer?