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No, new windows are different than new tabs. Tabbed browsing is a windowing system within a windowing system already. The new compose, if anything, is a window

• alanctgardner2 14y ago
  This is kind of necessary, though, because of the nature of sandboxing. It would be awesome if every windowing system could expose it's API to random websites securely, but the compromise we live with is that every system produces a smaller sandbox, and people work to add as much functionality as they can within whatever box they're given. It'd be cool to see the Gmail team leverage some cross-window communication within the new framework they're creating.