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Every 10 emails or so that I send from Outlook, I'll be queued to agree to download a 6.66Kb html 'Firefox file' - name made up of approx 30 numbers and letters. What is that? Is it a virus?

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Every 10 emails or so that I send from Outlook, I'll be queued to agree to download a 6.66Kb html 'Firefox file' - name made up of approx 30 numbers and letters. What is that? Is it a virus?

Every 10 emails or so that I send from Outlook, I'll be queued to agree to download a 6.66Kb html 'Firefox file' - name made up of approx 30 numbers and letters. What is that? Is it a virus?

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