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Test Info:

// This test is useful because mochitest-browser runs as an addon, so we test
// addon-scope paths here.
var ifr;
function test() {
ifr = document.createXULElement("iframe");
document.getElementById("main-window").appendChild(ifr);
is(ifr.contentDocument.nodePrincipal.origin, "[System Principal]");
ifr.contentDocument.open();
ok(true, "Didn't throw");
}
registerCleanupFunction(() => ifr.remove());