I've noticed while investigating another bug that this issue reproduces only on clean profiles. The way to fix this issue is by: 1. Go to about:preferences#privacy. 2. Select Custom mode and make sure that everything is selected except "Cookies" and refresh the page. 3. Then select "Standard" again and refresh the page. I hope this will help on your investigation.
Bug 1612882 Comment 2 Edit History
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I've noticed while investigating another bug that this issue reproduces only on clean profiles. The way to fix this issue is by: 1. Going to about:preferences#privacy. 2. Select Custom mode and make sure that everything is selected except "Cookies" and refresh the page. 3. Then select "Standard" again and refresh the page. I hope this will help on your investigation.