[tor-bugs] #25458 [Applications/Tor Browser]: UI customization half-broken in Tor Browser 8.0a3

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#25458: UI customization half-broken in Tor Browser 8.0a3
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 Reporter:  viktorj                   |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  High                      |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Major                     |     Resolution:
 Keywords:  tbb-regression            |  Actual Points:
Parent ID:  #25147                    |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by cypherpunks):

 Reproducible on Windows:
 {{{
 16:54:02.700 CustomizeMode:Error entering customize mode TypeError:
 messageNode.querySelector(...) is null
 Stack trace:
 CustomizeMode.prototype.maybeShowTip at resource:///modules/CustomizeMode.jsm:701:7
 CustomizeMode.prototype.enter/<@resource:///modules/CustomizeMode.jsm:358:7
 TaskImpl_run at resource://gre/modules/Task.jsm:319:42
 Handler.prototype.process at resource://gre/modules/Promise.jsm ->
 resource://gre/modules/Promise-backend.js:932:23
 this.PromiseWalker.walkerLoop at resource://gre/modules/Promise.jsm ->
 resource://gre/modules/Promise-backend.js:813:7
 this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm
 -> resource://gre/modules/Promise-backend.js:747:11
  1 CustomizeMode.jsm:374
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25458#comment:3>
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