Periodically when I clean my system, I get a message box asking to close MS Edge before I can continue. Since my default browser is Firefox, and whilst I cannot remove edge, and its useful as an occasional alternative, I've got everything about Edge I can find (in tools, options et al) disabled. So why does it keep rearing it's ugly head like this??
Open Edge.
Press 3 dots top right of page.
Scroll down to Settings near bottom.
Now on left of page select System and Performance.
Make sure 'Start up boost' and 'Continue running background extensions and apps when Microsoft Edge is closed' are turned off.