When some readers installed the new Microsoft Edge browser — which replaces the old “legacy Edge” — they got a big surprise. They discovered that Edge had somehow magically absorbed all the usernames and passwords they’d carefully saved in their previously installed browsers, such as Chrome, Firefox, Internet Explorer, and legacy Edge.What’s even more surprising is that Edge — which until recently couldn’t import or export passwords at all — may be doing this new behavior by design.The bad news is that you shouldn’t store passwords in Edge in the first place — or in any browser, really. This may...