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>If you run multiple tabs per process to keep memory usage and Xvfb instances limited then you won't be able to have separate browsing sessions, e.g. two concurrent navigations to the same origin could interfere with each other (cookies, local storage, etc). Another obstacle I have discovered is that you can only take screenshots for the tab that is currently active.

This is a huge flaw in NightmareJS, which is disappointing because of how beautifully simple its API is. A Nightmare fork rebuilt over headless Chrome would be the best of all worlds for browser automation.

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