[tor-bugs] #21679 [Applications/Tor Browser]: Fix FPI test for <track> element

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#21679: Fix FPI test for <track> element
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     Reporter:  arthuredelstein           |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 In our first-party isolation tests in #13749.2, I found that the `<track>`
 element test seems to be failing. I should try to fix this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21679>
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