(In reply to Tim Huang[:timhuang] from comment #26) > Inheriting the partitioned principal for the initial `about:blank` iframe is correct. I'm afraid it's not. If I open a page `<html><iframe></iframe></html>` as `file://` URI, the top level doesn't have a partition key. But prior to bug 543435, the iframe would have one. So the iframe doesn't just inherit the partitioned principal from the embedder.
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(In reply to Tim Huang[:timhuang] from comment #26) > Inheriting the partitioned principal for the initial `about:blank` iframe is correct. I'm afraid it's not. If I open a page `<html><iframe></iframe></html>` as `file://` URI, the top level doesn't have a partition key. But prior to bug 543435, the iframe would have one. So the iframe doesn't just inherit the partitioned principal from the embedder. Perhaps an issue can be reproduced already before bug 543435 here. I wonder what the iframe initially has as partitioned principal, before the async `about:blank` load completes.