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Webkits share cookies = ouch.. so you really need a VM.

New browser feature - open this site in a temp VM.

These days, most browsers come with a private browsing feature, which will dump your cookies, caches (for etag tracking), etc. when you're done.

If users must visit social websites like Facebook in privacy mode in separate browsers, perhaps they should rethink whether they should be using Facebook at all.

The convenience/security trade-off varies user to user, but for something as simple as FB, it might be considered overkill by most.

I would encourage browsers that support isolated profiles, multiple browsers that don't share cookie storage, or using a jailed site-specific browser approach.

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