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there's a fool following me changing out the certificate in my browser

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How do I stop it

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You may have ad/mal-ware. Further information can be found in this article;

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

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What's your computer system and Firefox version?

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Is your issue with a Firefox desktop or laptop?
Because that forum is where you posted from an Android device.

User Agent: Mozilla/5.0 (Android 10; Mobile; rv:68.0) Gecko/68.0 Firefox/68.0

Different forum for Android support. A Moderator here can move this thread to the Firefox for Android support queue.