[tbb-bugs] #18090 [Tor Browser]: Tor Browser 5.5a6 (High) eats all memory and crashes when playing video

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#18090: Tor Browser 5.5a6 (High) eats all memory and crashes when playing video
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  tbb-team
  bugzilla               |     Status:  new
         Type:  defect   |  Milestone:
     Priority:  Very     |    Version:
  High                   |   Keywords:  tbb-crash, tbb-performance-leaking,
    Component:  Tor      |  TorBrowserTeam201601
  Browser                |  Parent ID:
     Severity:           |    Sponsor:
  Critical               |
Actual Points:           |
       Points:           |
-------------------------+-------------------------------------------------
 When playing mp4 video not on whitelisted youtube, 2 tabs with videos are
 opened (autoplay, 'cause Temporary allow for site only by NoScript), one
 tab is closing by user, switch to another, no response, memory is growing,
 crash...
 The most suspicious component: NoScript (another one string-handling bug?)
 Continuing investigation...
 Log:
 Faulting application name: firefox.exe, version: 38.5.0.0, time stamp:
 0x00000000
 Faulting module name: mozalloc.dll, version: 38.5.0.0, time stamp:
 0x00000000
 Exception code: 0xc0000005
 Fault offset: 0x00001582
 Faulting process id: 0xf64
 Faulting application path: C:\%REMOVED%\Tor Browser\Browser\firefox.exe
 Faulting module path: C:\%REMOVED%\Tor Browser\Browser\mozalloc.dll
 DynamicSig[1].Name=OS Version
 DynamicSig[1].Value=6.1.7601.2.1.0.256.1
 DynamicSig[22].Name=Additional Information 1
 DynamicSig[22].Value=0a9e
 DynamicSig[23].Name=Additional Information 2
 DynamicSig[23].Value=0a9e372d3b4ad19135b953a78882e789
 DynamicSig[24].Name=Additional Information 3
 DynamicSig[24].Value=0a9e
 DynamicSig[25].Name=Additional Information 4
 DynamicSig[25].Value=0a9e372d3b4ad19135b953a78882e789

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18090>
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