[tbb-bugs] #22451 [Applications/Tor Browser]: about:cache is not useful anymore in ESR52-based Tor Browser (only wyciwyg-URIs if at all any)

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#22451: about:cache is not useful anymore in ESR52-based Tor Browser (only wyciwyg-
URIs if at all any)
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     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  ff52-esr,
     Severity:  Normal               |  TorBrowserTeam201705,
                                     |  GeorgKoppen201705
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 I wanted to investigate #21689 and started to look at `about:cache` output
 to check for isolation keys. But to my surprise there is only garbage in
 it (in e10s mode), meaning all URLs start with the wyciwyg scheme, or
 nothing at all (in non-e10s-mode).

 After re-reading #9336 I suspect the cached elements are basically not
 showing up in e10s mode either but instead some weird wyciwyg
 incarnations.

 Now, I tested manually that things are still cached and that cache
 isolation seems to be working which is a good thing. But we should
 investigate and fix this issue as it is highly confusing and might conceal
 bugs we would otherwise see.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22451>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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