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Managing PUP.Optional.Spigot in prefs.js malware

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MWB 3 identifies PUP.Optional.Spigot as malware (or a PUP) everyday, even if I quarantine it. The file is located at C:\Users\Jon\AppData\Roaming\Mozilla\Firefox\Profiles\yijbwobi.default\prefs.js

If I delete it, the file is recreated by Firefox, and MWB identifies it again. Any ideas on:

1. Is it a problem?

2. If so - how do I get rid of it permanently, if not - how can I stop MWB identifying it every day?

I am attaching the file with txt extension added. Maybe there is some text I can delete that will convince MWB that it is not a problem.



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Since its spawning after you remove it, it may be better to get one on one help from one of the experts.

So, for expert assistance, I suggest that you please follow the advice in this pinned topic: Available Assistance For Possibly Infected Computers.

It explains the options for free, expert help -->>AND<<-- the suggested, preliminary steps to expedite the process.
A malware analyst will assist you with looking into your issue.

Thank you

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