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How can I block somebody from deleting the history and cookies?

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When someone uses my computer I would like them to not have the ability to delete the history. So in a sense if someone would like to delete the history or cookies they would need to have a password to do so. How can I achieve this? Thankyou -Brett

When someone uses my computer I would like them to not have the ability to delete the history. So in a sense if someone would like to delete the history or cookies they would need to have a password to do so. How can I achieve this? Thankyou -Brett

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You can look at:

Remember that it's an extension and can be bypassed by starting Firefox in Save mode.