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The security level slider in Tor Browser disables various Javascript optimizations.

How can the presence or absence of optimizations be a browser tracking method?

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The presence of certain JavaScript features can be used to fingerprint the person like

"X's unique hash is ...".

Whereas the absence of certain JavaScript features can be used to fingerprint the person like

"has disabled X".

It's not recommended to tweak the Tor Browser Bundle in any way, as a lot of people use it (with default settings) and therefore your fingerprint only says "uses Tor Browser Bundle".


Browser fingerprinting resources:

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