[tbb-bugs] #27291 [Applications/Tor Browser]: about:tor not loading on Windows en-US

[Tor Bug Tracker & Wiki]

#27291: about:tor not loading on Windows en-US
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     Reporter:  arthuredelstein           |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  High                      |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  ff60-esr
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 This is somewhat similar to #26381, but may be a separate issue or even
 related to #27261.

 When I downloaded a fresh Tor Browser, the first time about:tor loaded
 fine. The second time, it did not load and I see the following error in
 the browser console:

 {{{
 NS_ERROR_FILE_ACCESS_DENIED: Component returned failure code: 0x80520015
 (NS_ERROR_FILE_ACCESS_DENIED) [nsIWebNavigation.loadURIWithOptions]
 browser-child.js:359
 }}}

 Then if I remove NoScript and HTTPS-E xpis from the extensions directory
 under profile.default, and restart the browser, about:tor loads properly
 again. If I add back either of those xpis, and restart the browser
 *twice*, the second time about:tor fails to load and I see the above error
 message again.

 If I keep NoScript and HTTPS-E in the extensions directory but remove tor-
 launcher xpi, then I also see about:tor loads correctly.

 So there seems to be some weird interaction between tor-launcher and
 NoScript/HTTPS-E. Perhaps all three tickets (this one, #26381, #27261)
 have the same underlying cause?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27291>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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