Rebase Tor Browser patches to 52 ESR
Here is FIREFOX_AURORA_52_BASE: https://github.com/mozilla/gecko-dev/commit/29475fa4c5a45574e57d8f14e5bde8261e482c35
Important dates: Firefox Beta 52: 2017-01-24 Firefox Release 52: 2017-03-07 Firefox 45 ESR End-of-life: 2017-06-13
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