>The criteria for adding content to the blocklist are: >* Blocking the content will not be noticeable to the Firefox user. >* It is possible to reimplement th

>The criteria for adding content to the blocklist are: >* Blocking the content will not be noticeable to the Firefox user. >* It is possible to reimplement the basic functionality of the content in HTML without Flash. There are three classes of content in the block list: Fingerprinting, Supercookie and Viewability. While I'm heard of various fingerprinting techniques besides Flash, I'm curious how "to reimplement without Flash the basic functionality" of supercookies, given its main feature is persistence despite of user's effort.