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how to get rid of bing on my Mac OS 10.13?
iMac 21.5", macOS 10.13
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You have adware/malware installed. Use Malwarebytes Anti-Malware for Mac. It may be necessary to run more than one scan. After scanning a couple of times, restart the computer and test. If necessary, follow the manual instructions. Do not download any other programs that are listed in the articles. Malwarebytes uninstall
https://www.2-spyware.com/remove-bing-redirect-virus.html
How to get rid of Bing.com Redirect - Virus removal guide