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I have the same experience as JRS. The options presented by websites re preferences seems to allow certain internet companies to set cookies and data despite deselection all options except "necessary/functional" ones. Seems these latter hide a post of trackers. If I could just select the ones I want to keep when purging these website data, it would make life a lot less annoying - having to re-enter ID's etc all the time for sites I need to visit. Wish Apple would allow that.