Why Firefox tell me this isn't the default browser?

When I run Firefox, or when I go to the options system and check, 8 Firefox tells me that this is not the default browser. However, if I close and go to some programs such as Excel and type a URL, then click, Firefox open. No idea what is the problem?

This means that not all the settings of Firefox as default browser are defined and that some are missing

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Tags: Firefox

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