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For me it worked fine too till FF45 Update came out. Could the author please patch this so it works again?

هذا التعليق كان على إصدارة سابقة من هذه الإضافة (1.7.5.1-signed) 

This bug should be fixed in 1.7.6 version, released now.
A workaround is to set the preference "extensions.profileswitcher.use_onbeforeunload" to false, but I suggest to try before the new version.