[tbb-bugs] #16528 [Tor Browser]: TorBrowser 5.0a3 acting very odd with Twitter due to IndexedDB

[Tor Bug Tracker & Wiki]

#16528: TorBrowser 5.0a3 acting very odd with Twitter due to IndexedDB
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     Reporter:  erinn    |      Owner:  tbb-team
         Type:  defect   |     Status:  new
     Priority:  major    |  Milestone:
    Component:  Tor      |    Version:
  Browser                |   Keywords:  TorBrowserTeam201507, ff38-esr,
   Resolution:           |  tbb-5.0a, tbb-usability-website
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by mikeperry):

 To people who have set the pref - you are very vulnerable to SuperCookie
 tracking. There is *no way* to delete IndexedDB storage. We do not do it
 on New Identity, and Firefox's Clear Private Data does not do it either.

 This is actually happening on a lot more sites, too. It turns out every
 site that uses the Modernizr feature detection library is broken with this
 pref flipped. Should be considered a Modernizr bug, but I bet a lot of
 people sites have pinned their Modernizr versions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16528#comment:11>
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