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Hello I just purchased a new I Mac and Firefox will open but not continue working. Help

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I can open Firefox on my new Imac, but it just stops at the log in screen. I have spoken to apple three times and they say it's your products. I don't thinks so but could sure use some suggestions to try before i throw the computer out the window Thank you Charlotte

I can open Firefox on my new Imac, but it just stops at the log in screen. I have spoken to apple three times and they say it's your products. I don't thinks so but could sure use some suggestions to try before i throw the computer out the window Thank you Charlotte

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What "log in screen"?