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This is optimizing for the wrong thing (developer convenience vs. user experience). People like using tabs in their browser more than windows.

This also ignores the other important benefit of mparch: sandboxing. The browser needs some elevated access but the page content does not.

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I don't see developer convenience and user experience as mutually exclusive. If an application is simpler and more consistent, that can save time for both users and developers.

(I also don't see how a one-process-per-DOM model prevents any other forms of sandboxing inside the browser. The OS doesn't understand webpages and cannot isolate them from each other - the browser does - so sandboxing pages is the browser's responsibility...)

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