[heroprotagonist]

It's one factor in a set of variables, that when combined can pinpoint you uniquely. This helps them overcome anti-tracking mechanisms like disabling cookies and such. Basically, by implementing this kind of technology, they know you don't want to be tracked and are attempting to do so anyway.

See the mechanisms used for this browser test, particularly the link for 'fingerprinting' after running the test: https://panopticlick.eff.org