When I enter a website incorrectly, instead of 404 error it replaces "www" with "ww7" and redirects me to a webpage that offers the domain for purchase.
When I enter "http://www.msftconnecttest.com/" into the Firefox address bar it redirects me to "http://ww7.msftconnectest.com/" When I enter the same address into MS Edge, I get: "HTTP 404 error That’s odd... Microsoft Edge can’t find this page" The 404 default web page is MUCH preferred over being redirected to some web site offering me the option to "buy this domain". Please advise.
When I tried the link; http://www.msftconnecttest.com/ all I got was a blank page.
As to the re-direct; You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.