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Firefox keeps storing a supercookie called "86868755-6b82-4842-b301-72671a0db32e.mozilla" on my computer. Is this normal and can it be prevented?

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I use a program called Security Task Manager to detect and remove whatever super cookies Firefox may store on my computer. Recently in 2017, Firefox started storing a super cookie named "86868755-6b82-4842-b301-72671a0db32e.mozilla" on my computer. I need to know if it is common for Firefox browsers to store this particular cookie on users' computers. Also, I would like to know if there any methods available to prevent Firefox from storing this cookie on my computer.

I use a program called Security Task Manager to detect and remove whatever super cookies Firefox may store on my computer. Recently in 2017, Firefox started storing a super cookie named "86868755-6b82-4842-b301-72671a0db32e.mozilla" on my computer. I need to know if it is common for Firefox browsers to store this particular cookie on users' computers. Also, I would like to know if there any methods available to prevent Firefox from storing this cookie on my computer.
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That is a special safe browsing cookie used by the fishing protection feature. Best is to leave such cookies alone and do not use external to remove such data because such software isn't aware of the Firefox internals and can easily corrupt your profile folder with the risk of losing your data.

// Unique first-party domain for separating the safebrowsing cookie.
// Note if this value is changed, code in test_cookiejars_safebrowsing.js
// should also be changed.
#define NECKO_SAFEBROWSING_FIRST_PARTY_DOMAIN \
  "safebrowsing.86868755-6b82-4842-b301-72671a0db32e.mozilla"

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