I am observing two FireFoxes running on same Windows-7 computer to be sharing same cookies, using JavaScript.
How do two instances of Chrome, IE, etc behave?
Can a browser be forced to allocate its own, private cookie memory?
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Yes. Firefox uses user profiles. As long as the instances are using the same profile, cookies will be shared. Same goes for Chrome. I am not sure about IE profiles, though (and whether it even has them).
Learn more about Firefox and Chrome Profiles.