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I have received a message saying "We've spotted a new security breach". Can anyone help me?

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I have received the following message: "We've spotted a new security breach: Search results for your ld@***.co.uk account have detected that your email may have been exposed. We recommend you act now to resolve this breach." Sender was Firefox Monitor: breach-alerts@mozilla.com. Not sure if this is a scam, but also not sure HOW I should act to resolve this breach, if it is legitimate. Can anyone help me?

I have received the following message: "We've spotted a new security breach: Search results for your ld@***.co.uk account have detected that your email may have been exposed. We recommend you act now to resolve this breach." Sender was Firefox Monitor: breach-alerts@mozilla.com. Not sure if this is a scam, but also not sure HOW I should act to resolve this breach, if it is legitimate. Can anyone help me?

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Yes, it's our e-mail. Check https://monitor.firefox.com/breaches for recent breaches. There should be more info & tips about it.