I somehow downloaded something that is causing Firefox and Edge to open at www-mysearch.com. A McAfee quick scan did not find this. How do I get rid of this?
It sounds like you inadvertently installed a (PUP- Browser Hijacker) which was bundled with what ever the program was. I would suggest running the Latest McAfee Getsusp Tool ( First ), as it will detect any Suspicious/Unknown Programs/Processes.
These detections will then be sent/added to the McAfee Global Threat Intelligence Base, which will assist in preventing future occurances. (Read how to use) Please enter your Email address under 'Preferences' with-in the Getsusp UI, before scanning.
I would then run Malwarebytes (Free) Remove/Delete any detections found/Restart. Follow up by scanning with AdwCleaner. To keep Malwarebytes (Free) do not enable the free trial/or activate the Paid/Pro Version.
You may elect to use this Excellent Removal Guide,it contains some of the same Tools Recommended above.
Please Let us know if these suggestions resolve your issue.
All the very Best,