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Firefox for mac failing to install

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Have new mac with catalina & installed Firefox browser ok last week. Now it's suddenly missing from apps folder !. Trying to re-install but keeps failing....download 77.0.1.dmg ok. click & open creates small firefox icon & popup message instructing to drag the icon onto the Application folder icon in the dock. This causes the app store to open but with a message saying 'unable to connect to app store' when I close the message the app store is open but no sign of the firefox app. New download or reboot have no effect. What am I doing wrong? Regards Phil

Have new mac with catalina & installed Firefox browser ok last week. Now it's suddenly missing from apps folder !. Trying to re-install but keeps failing....download 77.0.1.dmg ok. click & open creates small firefox icon & popup message instructing to drag the icon onto the Application folder icon in the dock. This causes the app store to open but with a message saying 'unable to connect to app store' when I close the message the app store is open but no sign of the firefox app. New download or reboot have no effect. What am I doing wrong? Regards Phil