When you installed Windows 10, did you change the default web browser? If not. then Edge is the default and it will load on startup.

https://malwaretips.com/threads/edge...ld-1803.82936/

How to change the default web browser in Windows 10:

https://www.computerworld.com/articl...ou-should.html

http://www.itprotoday.com/windows-se...0-just-5-steps

https://www.lifewire.com/change-defa...windows-446302

Check startups again using the info from this link:

https://www.windowscentral.com/how-c...tup-windows-10

Post back results, in case you still need to use AutoRuns.