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keep having to sign back into yahoo--yahoo says it is firefox 13

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I have to re-sign into yahoo every 5 minutes or so. I contacted yahoo and they said it is a problem with firefox 13. Prior to the update I stayed signed in for 2 weeks

I have to re-sign into yahoo every 5 minutes or so. I contacted yahoo and they said it is a problem with firefox 13. Prior to the update I stayed signed in for 2 weeks

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There is a very long thread here in the forum on this problem.

One possible cause is your proxy settings. If you check this deeply buried dialog, you may be able to correct it:

orange Firefox button or classic Tools menu > Options > Advanced > Network

Click the "Settings" button and choose either "No Proxy" or "Use System Settings" option, and OK the change. See whether that helps.

More suggestions here: https://support.mozilla.org/en-US/questions/928922#answer-339570