Thanks for your positive feedback. E-Tag can be used to track you, if you're interested in this you can read the study 'Ayenson, Mika D., et al. "Flash cookies and privacy II: Now with HTML5 and ETag respawning. (2011).' (https://ptolemy.berkeley.edu/projects/truststc/education/reu/11/Posters/AyensonMWambachDpaper.pdf)