[tbb-bugs] #20726 [Applications/Tor Browser]: Preferences page will not open

[Tor Bug Tracker & Wiki]

#20726: Preferences page will not open
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     Reporter:  cactusjack                |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Immediate                 |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Critical                  |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Using Tor Browser Hardened 6.5a4-hardened default installation on a Debian
 Linux 8.6 Desktop PC, I click in Edit -> Preferences and get this error:
 (in Portuguese):

 Erro na análise do XML (XML analysis error): entidade indefinida
 (indefinite entity)
 Localização (location): about:preferences
 Número da linha (Line number) 647, Coluna (column) 7:      <checkbox
 id="thirdpartyIsolateCB"
 ------^

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20726>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online