[tor-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 Browser        |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  ff52-esr, TorBrowserTeam201702  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:
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Comment (by mcs):

 While reviewing fixed toolkit bugs for #19048, I learned that there is
 some information about system extensions here:
 https://gecko.readthedocs.io/en/latest/toolkit/mozapps/extensions/addon-
 manager/SystemAddons.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21431#comment:7>
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