Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
I think we should prevent the pref to be flipped to false if an addon using the ContextualIdentity is enabled. This would need to be fixed in m-c. I'll try to ask around if there's any objection to this solution.
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Popup is blank
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Popup shows something
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