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Suspicious files in Firefox Extension Folder

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I found a suspicious file in the firefox extension folder on my PC and laptop.


I think it is a kind of malware, because it modifies the Firefox settings by injecting a user.js file that disables all firefox updates.


Here are the links to virustotal (currently only 1 AV detects it as malware):






I also submitted the files to ESET and deleted them, but I don't know if they caused more harm, a full scan with ESS doesn't find anything.

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