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Facebook. Firefox will not open most facebook emails

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When I receive an email from a facebook source, Fierfox says it cannot open the [age. It used to open the same messages in the past. How do I get Firefox to open these?

When I receive an email from a facebook source, Fierfox says it cannot open the [age. It used to open the same messages in the past. How do I get Firefox to open these?

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Firefox is just a Browser so what email site are you referring to here with the issue?

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