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Thunderbird notification pop-up

Every time I get an email, Thunderbird shows a little pop-up on my screen, saying x new emails from xxx. Oftentimes, I have co-workers look at my screen, they don't need to know everytime I get an email that it's from Amazon, Zappos, Banana Republic, or Victoria's Secret. So, here's how you turn it off:
  1. Click Edit and select Preferences
  2. Click Advanced
  3. Select the General tab
  4. Click the Config Editor button
  5. Search for biff
  6. Set mail.biff.show_alert to false

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