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How can I stop Firefox from repeatedly, automatically reloading Gmail?

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When Gmail is open, Firefox keeps reloading Gmail in new tabs, about every 5 minutes.

When Gmail is open, Firefox keeps reloading Gmail in new tabs, about every 5 minutes.

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I can't think of any good reason for that to be happening. Do you use any add-ons that monitor Gmail (such as new mail notifiers), or could the new tabs be externally driven (i.e., sending a URL to your default browser)?