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Avast reports a threat, URL:Blacklist when updating Firefox

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Joe
Joe
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When updating Firefox, I my Avast antivirus often pops up with a Threat Secured window: Is there some nefarious code in your updater? I attached a screen grab of the warning window.

When updating Firefox, I my Avast antivirus often pops up with a Threat Secured window: Is there some nefarious code in your updater? I attached a screen grab of the warning window.
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