A few other places this issue has been reported. https://superuser.com/questions/1823318/how-to-fix-investigate-windows-defender-detecting-malware-in-the-vss-snapshots-f https://www.reddit.com/r/browsers/comments/18lxg3w/firefox_cache_phishpz/ https://answers.microsoft.com/en-us/windows/forum/all/antivirus-similar-to-april-23-2023-concerning/ff812d4c-c0e9-48b8-b3cd-7750adda842c It seems like a false positive - we'll reach out to microsoft to let them know and ask for advice regarding ways to mitigate the problem.
Bug 1872395 Comment 14 Edit History
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A few other places this issue has been reported. https://superuser.com/questions/1823318/how-to-fix-investigate-windows-defender-detecting-malware-in-the-vss-snapshots-f https://www.reddit.com/r/browsers/comments/18lxg3w/firefox_cache_phishpz/ https://answers.microsoft.com/en-us/windows/forum/all/antivirus-similar-to-april-23-2023-concerning/ff812d4c-c0e9-48b8-b3cd-7750adda842c It seems like a false positive - we'll reach out to microsoft to let them know and ask for advice regarding ways to mitigate the problem. The link for this issue doesn't say much about what the threat is: https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=PWS:HTML/Phish.PZ&threatId=-2147255708