[tor-bugs] #30372 [Applications/Tor Browser]: Backport Letterboxing

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#30372: Backport Letterboxing
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 Reporter:  tom                                  |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-resolution,       |  Actual Points:
  TorBrowserTeam201905                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by gk):

 That's not working for me. I think the reason is that there is no
 `Services.locale.appLocaleAsLangTag` on esr60 and hence this breaks early
 on. You'll see something like
 {{{
 TypeError: Services.locale.appLocaleAsLangTag is undefined[Learn More]
 RFPHelper.jsm:189:5
 }}}
 in the browser console.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30372#comment:2>
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