I noticed them on the following domains:
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https://www.naij.com/
https://www.tuko.co.ke/
https://www.nur.kz/
I'd suggest to add this rule:
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||n.mailfire.io^$third-party
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https://www.naij.com/
https://www.tuko.co.ke/
https://www.nur.kz/
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||n.mailfire.io^$third-party
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||pixel.naij.com^