The main window guarded will-navigate but not will-redirect, and left
the default session's permission handler at allow — looser than the
provider sign-in windows. Gate redirects with the same off-origin check
and deny every permission request/check by default. The first-party
renderer requests no web permissions, so denial changes nothing it does
while removing the grant a compromised page would otherwise inherit.
Verified end to end.
ZacharyZhang-NY
7db777b5d3