Rebase Tor Browser patches to ESR 45

Once Firefox 45 ESR reaches beta state we should start rebasing our existing patches. This ticket is tracking that progress + the upcoming issues.

For reference:

  • Firefox 45 Alpha: 2015-12-14
  • Firefox 45 Beta: 2016-01-26
  • Firefox 45 Release (and ESR): 2016-03-08
  • Firefox 38 ESR end-of-life: 2016-05-31

See also Mozilla's Merge/Release schedule, Release overview, and Rapid Release Calendar.

Here are TBB5.5a patches upstreamed to Firefox. These will be present in ESR45 and so we won't need to rebase them from TBB 5.5a to TBB 6.0a:

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