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screen locked on iPhone 7+ Asking to press button OK

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king7hlg
king7hlg
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on my iPhone 7+ the firefox screen is locked. message says: https://networkdefense-guardian.com Your device is infected and vulnerable to cyber-attacks and data theft! To protect your iPhone press the button below. there are two buttons: CONFIRM is not active OK in colour blue, I assume is active. I have not pressed the button.

How do I prevent this hack, assuming it is a hacker? How do I unlock screen safely so can use firefox?

on my iPhone 7+ the firefox screen is locked. message says: https://networkdefense-guardian.com Your device is infected and vulnerable to cyber-attacks and data theft! To protect your iPhone press the button below. there are two buttons: CONFIRM is not active OK in colour blue, I assume is active. I have not pressed the button. How do I prevent this hack, assuming it is a hacker? How do I unlock screen safely so can use firefox?