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Error while attempting to run FireFox on Mac

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I need assistance with my mac. Each time I try to open up Firefox browser I’m alerted that I can not run two separate instances at once. Warning says Firefox is already runing and you can not run two versions at once

I need assistance with my mac. Each time I try to open up Firefox browser I’m alerted that I can not run two separate instances at once. Warning says Firefox is already runing and you can not run two versions at once

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Hello,

I am not completely sure if the commands translate, but I believe you can execute killall firefox to stop all running instances of Firefox.

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this didnt work however im loged into FireFox browser now so idk. i enteres killall firefox in terminal and it was unrecognized