I somehow stumbled across a “bad” website that is putting up a fake malware warning, and stopping me getting to any other tab on Edge.
I crashed Edge deliberately, but when it restarts, it automatically reopens the tabs, including the one which caused the problem.
This is a BIG design flaw. Chrome lets you restore your tabs if you choose – but you can elect not to.
How could they screw this up so badly?
This web post sums it all up nicely – https://blog.malwarebytes.com/cybercrime/2015/09/regaining-control-over-edge/