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I disagree. You might be able to use it to _guess_ but all browsers can throw a quota exceeded exception under normal behaviour. I see this every now and then on mobile devices where the phone is so full the browser refuses to store more localStorage items.

This is exactly what I want to prevent though - I want to prevent dodgy sites from using the quota exceeded exceptions from localStorage to (100% accurately in my experience) guess that I'm browsing in private mode.

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