Don't save the master password until autofill.
Don't save the master password until autofill.

Rather than saving the master password every time the hash is
recalculated, only save it when the autofill button is pressed. This
avoids storing a password in the case where the user cancels out of the
popup, and means it will only write to storage once per invocation.

tornewuff/pawhash,cinhtau/pawhash,tornewuff/pawhash,cinhtau/pawhash