[tor-bugs] #17125 [Quality Assurance and Testing]: Fix broken tests due to changes in Tor Browser 5.5a3

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#17125: Fix broken tests due to changes in Tor Browser 5.5a3
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 Reporter:  gk                             |          Owner:  boklm
     Type:  defect                         |         Status:  new
 Priority:  normal                         |      Milestone:
Component:  Quality Assurance and Testing  |        Version:
 Keywords:                                 |  Actual Points:
Parent ID:                                 |         Points:
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 Tests related to `browser.startup.homepage_override.mstone`,
 `startup.homepage_override_url` and
 `browser.startup.homepage_override.buildID` are broken in the alpha
 series.

 This is related to the changes #13512.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17125>
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