[tbb-bugs] #30832 [Applications/Tor Browser]: Fix tor-browser tbb-tests

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#30832: Fix tor-browser tbb-tests
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 Reporter:  acat                      |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  ReleaseTrainMigration     |  Actual Points:  2
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:  Sponsor58
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Comment (by Thorin):

 Replying to [comment:5 acat]:
 > * c73bfe7f3b21421c7349267f2abac9f90f503b73: we need `layout.css.line-
 height.normal-as-resolved-value.enabled = false`, otherwise `line-height`
 property is read as `normal` and we cannot get the number in pixels

 You should update that to fall back to clientRect (which I do on TZP):
 you'll need to anyway once you are based on ESR78 (or rapid release)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30832#comment:6>
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