[tor-bugs] #18995 [Applications/Tor Browser]: Investigate CacheStorage feature for tracking usage in Tor Browser

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#18995: Investigate CacheStorage feature for tracking usage in Tor Browser
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 Reporter:  gk                              |          Owner:
     Type:  task                            |  arthuredelstein
 Priority:  High                            |         Status:  assigned
Component:  Applications/Tor Browser        |      Milestone:
 Severity:  Major                           |        Version:
 Keywords:  ff45-esr, TorBrowserTeam201605  |     Resolution:
Parent ID:                                  |  Actual Points:
 Reviewer:                                  |         Points:
                                            |        Sponsor:
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Changes (by arthuredelstein):

 * owner:  tbb-team => arthuredelstein
 * status:  new => assigned


Comment:

 Replying to [comment:1 gk]:
 > Seems the worker case is no issue for us:
 >
 > https://mxr.mozilla.org/mozilla-
 esr45/source/dom/cache/CacheStorage.cpp#200

 CacheStorage is also "blocked" in the non-worker case. Here's the relevant
 line:
 https://mxr.mozilla.org/mozilla-
 esr45/source/dom/base/nsGlobalWindow.cpp#10244

 I manually confirmed that caches.open("test") reports a SecurityError in
 our TBB/ESR45 alpha. I will work on writing a mochitest that ensures that
 the CacheStorage is inactive in both workers and main-thread content.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18995#comment:3>
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