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Mac Catalina Update and now ffox won't work. sometimes get 'close firefox' when not open

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it says 'A copy of Firefox is already open. Only one copy of Firefox can be open at a time.' or just won't run sometimes. just downloaded 69.0.3 which seems to have come out today but still stuck. apple really have stuffed up this time!!

it says 'A copy of Firefox is already open. Only one copy of Firefox can be open at a time.' or just won't run sometimes. just downloaded 69.0.3 which seems to have come out today but still stuck. apple really have stuffed up this time!!