Yes, by providing COOP and COEP, we can load the same-origin document in webCOOP+COEP process. If I understand correctly, for each origin, there would be only one webCOOP+COEP process. However, the problem is the original test need to 4 and 5 processes at the same time. I think we still need a test for LocalStorage consistency for fission, but it should be another test scenario. So I suggest to create a new test, not modify this one.
Bug 1598800 Comment 12 Edit History
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Yes, by providing COOP and COEP, we can load the same-origin document in webCOOP+COEP process. If I understand correctly, for each origin, there would be only one webCOOP+COEP process. However, the problem is the original test need to 4 and 5 processes at the same time. And it is hard to modify the test scenario from five into two processes. I think we still need a test for LocalStorage consistency for fission, but it should be another test scenario. So I suggest to create a new test, not modify this one.