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Unable to open FF from tool bar on Imac

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Restored FF to Imac. Attemped to open but get message “a copy of FF is already open to cannot open this one” Spent 6 hours with Apple Support to examine every file and delete anything related to FF or Mozilla except for the VPN program. This did not solve problem. Apple said could do no more and suggeted mozzilla support. How to get rid of the notice and enable opening of FF. on 2024 Imac M4 chip.

Restored FF to Imac. Attemped to open but get message “a copy of FF is already open to cannot open this one” Spent 6 hours with Apple Support to examine every file and delete anything related to FF or Mozilla except for the VPN program. This did not solve problem. Apple said could do no more and suggeted mozzilla support. How to get rid of the notice and enable opening of FF. on 2024 Imac M4 chip.

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