We don't support remote extensions yet, sorry. We need multi-e10s support first which is being worked on as we speak. You can follow Bug 1535365 and dependents.
Bug 1494029 Comment 7 Edit History
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GV/Android doesn't support remote extensions yet, sorry. We need multi-e10s support first which is being worked on as we speak. You can follow Bug 1535365 and dependents.