Do you have `privacy.resistFingerprinting` set to true in the "broken" profile, and if so, does resetting it and restarting the browser fix the issue?
Bug 1726524 Comment 12 Edit History
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Do you have `privacy.resistFingerprinting` set to true in the "broken" profile (you can check in about:config), and if so, does resetting it and restarting the browser fix the issue?