[tor-bugs] #33890 [Applications/Tor Browser]: Rename .xul to .xhtml

[Tor Bug Tracker & Wiki]

#33890: Rename .xul to .xhtml
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam202004
Actual Points:                            |  Parent ID:  #33533
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Firefox did a mass rename of all .xul files to .xhtml in
 https://bugzilla.mozilla.org/show_bug.cgi?id=1579952. We need to do the
 same in torbutton and tor-launcher, as well as in several Tor Browser
 patches that involve UI.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33890>
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