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WouldReuseInnerWindow also returns true if the new window is same-origin with the old one about:blank document. This condition exists in order to handle some sloppiness with respect to the principals on initial about:blank documents. Chrome callers sometimes parent chrome windows (with XUL document) to content windows. But this parenting causes us to push the cx of the content window during window creation, meaning that the subsequent load of chrome://foo.xul blows away the old inner window and any expandos on it. We can handle this case more precisely by skipping the cx push for type="chrome" windows. Furthermore, this was also necessary to prevent the inner window from being blown away in the call to SetOpenerScriptPrincipal once nsWindowWatcher gets the window back from the window creator (and after it's already told consumers about the window via "domwindowcreated"). But we fixed this nastiness in the previous patches. So we can remove this case. By doing so, we can prevent inner windows from ever changing origins, which is very important for compartment security invariants. |
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