[tor-bugs] #26219 [Applications/Tor Browser]: about:tor page is not loading in pre-nightly Tor Browser builds based on ESR60

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#26219: about:tor page is not loading in pre-nightly Tor Browser builds based on
ESR60
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Very High            |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  ff60-esr,
     Severity:  Normal               |  TorBrowserTeam201805
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 Testing a pre-nightly Tor Browser build based on ESR60 it turns out the
 `about:tor` page is not loading. In the error console exceptions are
 thrown:
 {{{
 [Exception... "Component returned failure code: 0x80004004
 (NS_ERROR_ABORT) [nsIPrefBranch.getComplexValue]"  nsresult: "0x80004004
 (NS_ERROR_ABORT)"  location: "JS frame :: jar:file:///path/to/tor-browser
 /tor-browser_en-
 US/Browser/browser/omni.ja!/components/nsBrowserContentHandler.js :: get
 startPage :: line 660"  data: no]
 }}}
 I guess, not treating that `browser.startup.homepage` as preference with a
 complex value is not working as well as we thought.

 (However, it worked while I was testing the patch for #26100 for some
 reason).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26219>
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