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Is "fingerprint" here referring to the Javascript fingerprint ? (https://panopticlick.eff.org/)

This is much more potent than IP address, but there don't seem to be much defense against this.

There is. You can either randomize the fingerprint (per-session fresh vm configured from a pool of possibilities) or unify it (tor/tails), provided that enough people do the same.

Is there a (recommended) add-on that does this ?

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