@tr3x try open cmd with adminsitrator rights (right click -> run as admin)
cd c:\Program Files\Windows Defender
MpCmdRun.exe -removedefinitions -dynamicsignatures
MpCmdRun.exe -SignatureUpdate

@gmiazga are there any news? if it is a false positive, it should be reported to microsoft
https://docs.microsoft.com/de-de/windows/security/threat-protection/microsoft-defender-antivirus/antivirus-false-positives-negatives

I uploaded the .dll-file on VirusTotal - only Microsoft detects the file as BrowserModifier:Win32/Foxiebro.

I have the problems with Foxiebro, too. Is it possible that the alert is false positive?

Short question: Is it possible that the search engines are synced to my computers?