[tbb-bugs] #21431 [Applications/Tor Browser]: Clean-up system extensions shipped in Firefox 52

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#21431: Clean-up system extensions shipped in Firefox 52
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     Reporter:  gk                   |      Owner:  tbb-team
         Type:  task                 |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  ff52-esr,
     Severity:  Normal               |  TorBrowserTeam201702
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 In addition to `pdfjs` there are 6 system add-ons shipped in Firefox 52
 looking at the current beta branch. (on `release` there are 5 right now).
 We should investigate whether we need all of them and if not make sure
 that they don't interfere with Tor Browser.

 Of particular interest are `aushelper` and `e10srollout` I guess.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21431>
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