Thank you, I tested as you described and popups opened without any problems in
Firefox 50.1.0.
It is not working in Seamonkey 2.46, but I'll post this to Seamonkey forum.
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The Problem is not fixed in Firefox 50.1.0.
When adding "" without quotes to exceptions, "http://; automatically
appears just before "". "http://; can't be deleted.
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