Web browser keeps opening to msn by itself randomly

Hi every now and then with no user interaction my default web browser firefox opens to the msn home page (my home page is google)(this also happens if edge is set as the default browser). It is completely random and comes up over whatever I'm currently doing on my computer stopping me in my tracks this is very annoying. I've run anti virus software and its come up clean, I reloaded my operating and it returned after a few weeks and I haven't added new apps or software that may have caused it. The only thing I've found that may be involved is a system restore point automatically created by windows module installer what its for I have no idea, so I tried a restore point prior to that date and the issue seemed to go away but alas it has returned this time there hasn't been a restore point created by anything that might indicate a change. Any ideas on what be triggering my web browser to open to msn?