Disable New Tiles feature in Tor Browser based on ESR 38
On about:newtab are now shown tiles with affiliate links that are fetched from Mozilla's infrastructure and pings containing detailed data about which tiles have been seen are sent back. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1042214#c33 for more detailed information.
We should avoid all these things although our default Private Browsing Mode with no history being enabled might mitigate the tracking risks.
https://bugzilla.mozilla.org/show_bug.cgi?id=1073823 contains a way turning that feature off and https://bugzilla.mozilla.org/show_bug.cgi?id=1030832 is the meta bug. https://bugzilla.mozilla.org/show_bug.cgi?id=1030832#c6 is interesting and we want to keep an eye on this as "a website defining own enhanced tiles via a meta tag" sounds potentially dangerous to me.