Public bug reported:

We have a lot of crashes in Firefox 19 with the following traces:

0       libxul.so       imgRequestProxy::UnblockOnload  imgRequestProxy.cpp:818
1       libxul.so       imgStatusTracker::MaybeUnblockOnload    
imgStatusTracker.cpp:766
2       libxul.so       imgStatusTrackerObserver::OnStopFrame   
imgStatusTracker.cpp:133
3       libxul.so       mozilla::image::Decoder::PostFrameStop  Decoder.cpp:244
4       libxul.so       mozilla::image::nsPNGDecoder::end_callback      
nsPNGDecoder.cpp:858
5       libxul.so       MOZ_PNG_push_have_end   pngpread.c:1453
6       libxul.so       MOZ_PNG_push_read_chunk         pngpread.c:358
7       libxul.so       MOZ_PNG_process_data    pngpread.c:40
8       libxul.so       mozilla::image::nsPNGDecoder::WriteInternal     
nsPNGDecoder.cpp:349
9       libxul.so       mozilla::image::Decoder::Write  Decoder.cpp:79
10      libxul.so       mozilla::image::RasterImage::WriteToDecoder     
RasterImage.cpp:2648
11      libxul.so       mozilla::image::RasterImage::DecodeSomeData     
RasterImage.cpp:3167
12      libxul.so       
mozilla::image::RasterImage::DecodeWorker::DecodeSomeOfImage    
RasterImage.cpp:3478
13      libxul.so       mozilla::image::RasterImage::DecodeWorker::Run  
RasterImage.cpp:3403
14      libxul.so       nsThread::ProcessNextEvent      nsThread.cpp:627
15      libxul.so       NS_ProcessNextEvent_P   nsThreadUtils.cpp:238
16      libxul.so       mozilla::ipc::MessagePump::Run  MessagePump.cpp:82
17      libxul.so       MessageLoop::RunInternal        message_loop.cc:215
18      libxul.so       MessageLoop::Run        message_loop.cc:208
19      libxul.so       nsBaseAppShell::Run     nsBaseAppShell.cpp:163
20      libxul.so       nsAppStartup::Run       nsAppStartup.cpp:290
21      libxul.so       XREMain::XRE_mainRun    nsAppRunner.cpp:3823
22      libxul.so       XREMain::XRE_main       nsAppRunner.cpp:3890
23      libxul.so       XRE_main        nsAppRunner.cpp:4084
24      firefox         main    nsBrowserApp.cpp:174
25      libc-2.13.so    libc-2.13.so@0x19113    
26      libdl-2.13.so   libdl-2.13.so@0x3ea4    
27      libc-2.13.so    libc-2.13.so@0x17dff4   
28      ld-2.13.so      ld-2.13.so@0x1f30       
29      libc-2.13.so    libc-2.13.so@0x19029    
30      firefox         firefox@0x1c90  
31      firefox         firefox@0xfa20  
32      ld-2.13.so      ld-2.13.so@0xeba0       
33      ld-2.13.so      ld-2.13.so@0x1f918

(from https://crash-stats.mozilla.com/report/index/bff34a78-7e58-41be-
af57-db7272130227)

0       libxul.so       nsQueryInterface::operator const        nsCOMPtr.cpp:14
1       libxul.so       nsCOMPtr_base::assign_from_qi   nsCOMPtr.cpp:56
2       libxul.so       imgRequestProxy::UnblockOnload  nsCOMPtr.h:556
3       libxul.so       imgStatusTracker::EmulateRequestFinished        
imgStatusTracker.cpp:454
4       libxul.so       imgStatusTracker::RemoveConsumer        
imgStatusTracker.cpp:478
5       libxul.so       imgRequest::RemoveProxy         imgRequest.cpp:224
6       libxul.so       imgRequestProxy::DoCancel       imgRequestProxy.cpp:306
7       libxul.so       imgRequestProxy::imgCancelRunnable::Run         
imgRequestProxy.h:122
8       libxul.so       nsThread::ProcessNextEvent      nsThread.cpp:627
9       libxul.so       NS_ProcessNextEvent_P   nsThreadUtils.cpp:238
10      libxul.so       mozilla::ipc::MessagePump::Run  MessagePump.cpp:82
11      libxul.so       MessageLoop::RunInternal        message_loop.cc:215
12      libxul.so       MessageLoop::Run        message_loop.cc:208
13      libxul.so       nsBaseAppShell::Run     nsBaseAppShell.cpp:163
14      libxul.so       nsAppStartup::Run       nsAppStartup.cpp:290
15      libxul.so       XREMain::XRE_mainRun    nsAppRunner.cpp:3823
16      libxul.so       XREMain::XRE_main       nsAppRunner.cpp:3890
17      libxul.so       XRE_main        nsAppRunner.cpp:4084
18      firefox         main    nsBrowserApp.cpp:174
19      libc-2.15.so    libc-2.15.so@0x194d3    
20      libdl-2.15.so   libdl-2.15.so@0x3eb0    
21      libc-2.15.so    libc-2.15.so@0x1a6000   
22      ld-2.15.so      ld-2.15.so@0x2d4        
23      libc-2.15.so    libc-2.15.so@0x193e9    
24      firefox         firefox@0x1d00  
25      firefox         firefox@0xfc00  
26      ld-2.15.so      ld-2.15.so@0xf270       
27      ld-2.15.so      ld-2.15.so@0x21938

(from https://crash-
stats.mozilla.com/report/index/0cc0981e-d445-48e6-aa19-b6ffa2130227)

Although I've so far been unable to reproduce it, I suspect this is
caused by our menubar addon (and there's a 100% correlation of these
crashes with users who have it installed)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1134409

Title:
  Various imagelib related crashes

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