Investigate timestamp leaks in TBB
On 2022-03-29's weekly meeting, we discussed applying the timestamp of the update to all TBB files, to avoid leaking when a user started Tor Browser and applied updates and/or when the user started using TBB.
We should also check which preferences Firefox saves, as they could leak data about the user's Tor Browser usage as well.
So far, boklm found that browser.laterrun.bookkeeping.profileCreationTime
is exposing it.