My safari automatically change the browser to microsoft bing and yahoo from google .
- Why my browser changes from google to bing or yahoo ?
- Sometimes it automatically open new websites during work ?
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The computer may have picked a piece of Malware or Adware.
Suggest downloading from a Trusted Developer and Respected ASC Contributor the application Malwarebytes for Mac. It is free or paid for added features. Run the Application and it should remove the malware / adware. Once done, restart computer and test.
There are no known Viruses in the wild that self replicate and affect macOS. There are Malware and Adware that does affect macOS and are often times downloaded as part of an Application from Third Party UnTrusted Site and get installed along with the Application.