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Microsoft Edge keeps passwords in memory as plaintext, a move Microsoft insists is safe
(www.windowscentral.com)
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In practice, most people's chrome will have the key available in one form or another all the time anyways because most people don't need to unlock their stored passwords every time they use one.
Not saying this isn't dumb by MS, but it doesn't open up a new attack vector.
It doesn't open up a new vector, but it makes an obvious one MUCH larger.