[tbb-bugs] #21876 [Applications/Tor Browser]: e10s is not enabled on Linux (and probably OS X) by default in ESR 52 based nightlies

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#21876: e10s is not enabled on Linux (and probably OS X) by default in ESR 52 based
nightlies
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Major                                |     Resolution:
 Keywords:  ff52-esr, tbb-7.0-must-alpha,        |  Actual Points:
  TorBrowserTeam201704R                          |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 Thanks. It seems to me we don't need the changes in `install.rdf.in`? They
 are bypassed anyway according to
 https://gecko.readthedocs.io/en/latest/toolkit/mozapps/extensions/addon-
 manager/SystemAddons.html. We need to make sure to block system extension
 updates in general, though. But that we already do (learnt the hard way :)
 ).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21876#comment:17>
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