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How do I Stop A Persistently Installing Cookie?

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A cookie from "centrexity.com" is constantly trying to install itself onto my phone. I have the Self Destructing Cookies with notifications enabled (helps me to remember to whitelist sites that are useful). The cookie\ site makes installation attempts when Ff is not on and even when I have fully powered off and back on (the notification appears on my phone's home screen).

A cookie from "centrexity.com" is constantly trying to install itself onto my phone. I have the Self Destructing Cookies with notifications enabled (helps me to remember to whitelist sites that are useful). The cookie\ site makes installation attempts when Ff is not on and even when I have fully powered off and back on (the notification appears on my phone's home screen).

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When I cross search centrexity and Firefox on Google and explore around a bit, it leads me to this extension:

Simple YouTube to MP3/MP4 Converter and Downloader https://addons.mozilla.org/firefox/addon/simple-youtube-converter/

Do you have that installed?