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Firefox Can't Detect itself or set itself as a default browser

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OS: Windows 10 (latest ver) Firefox (ver 53, 64bit) Brand new install.

Problem: FF not shown in Windows 10 default apps. Drop down only shows usual IE or Edge. FF complains it isn't default browser when launched.

Work-around: Force Windows to set FF as default by ignoring Default apps and going to original default apps settings from Windows 7 that still exists in Windows 10. Set FF to aquire all its defaults. FF now opens as default however STILL complains it is not default. Note that Win 10 default apps now shows FF as default browser. However clicking on it shows no FF in drop down.

Likely bug source: FF installer fails to add/modify required registry key that sets default apps in Windows 10. I have not been able to track down this new reg branch as it is distinct from the original one from Windows 7/8.1.