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If nothing is downloaded, is there anything left behind on the hard drive. Say viewing a video or reading an article.

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With the Tor Browser? Ideally nothing.

New bugs are unfortunately found from time to time and then fixed. One current example is the clipboard “cache”.

If disk leaks are a problem in your threat model, use Tails. It gives you the guarantee that nothing will be written on disks, unless explicitly done as a user action.

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