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On Version 7 you need only set extensions.checkCompatibility.nightly and it will always work for future versions like Version 8 and so on

هذا التعليق كان على إصدارة سابقة من هذه الإضافة (1.1.1-signed.1-signed) 

This is true, but it doesn't help Aurora, Beta, and release users who want to use add-ons not yet marked compatible.