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> This is brilliant, not only for privacy but for speed.

But these resources are probably already cached by the browser anyway (using the appropriate http headers). So how can this solution add any improvements to that, once the resources have been loaded for the first time?

If your browser usage patterns include frequent "private browsing" or frequent cache clearing, this can be a noticeable speed boost.

I often using "private browsing" as a way to get another login session (e.g., login a test user while still having admin user logged in).

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