[tor-bugs] #31322 [Applications/Tor Browser]: Fix about:tor assertion failure in esr68 linux debug builds

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#31322: Fix about:tor assertion failure in esr68 linux debug builds
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     Reporter:  acat                      |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  ff68-esr
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 I found this assertion failure when testing #30429 in linux, debug build.
 It happens when loading `about:tor`:

 `Assertion failure: foundDefaultSrc (about: page must contain a CSP
 including default-src), at /home/user/tor/tor-
 browser/dom/base/Document.cpp:5179`

 We should investigate this, but not sure if it's `tbb-9.0-must-nightly`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31322>
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