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screen says "file not found" try again

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I have been on Firefox for years without problems. I have just now changed my user name and password. Will this fix the problem?

I have been on Firefox for years without problems. I have just now changed my user name and password. Will this fix the problem?

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Hello,

You screen with what ? Firefox ?

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Hi linda1241940, I think we do need more information on when you get that message. For example, trying to start Firefox, before any window displays. After the frame appears but before your home page appears. Or when you try to open a particular web address or local page?