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[Matt Pharoah <1474003@xxxxxxxxxxxxxxxxxx>]

Can confirm this behaviour on Ubuntu 14.04. I'm using Firefox 39 with
only one addon (ublock origin) and all plugins either disabled or set to
ask for permission to run. Experiencing crashes in both Firefox 39 and
Firefox 40 Developer Edition, but Firefox 38 is fine.

Playing flashplayer video for 0 - 20 seconds is a guaranteed way to
crash Firefox 39, but it also can happen on pages with no flash content
and with flashplayer completely disabled. In fact, it can even happen on
pages with no HTML content at all (eg. a .png image)

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https://bugs.launchpad.net/bugs/1474003

Title:
  Firefox 39 keeps crashing

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Firefox 39 keeps crashing after update from Firefox 38.
  Crashes are random but when idle happens at least once a hour or more frequently when actively used.

  When replaced with binaries from Mozilla there is no problems at same
  machine with same profile.

  There are at least 1100 identical reports and they seems to be unique
  for Ubuntu build.

  Below is part of crash report:

  Crashing Thread
  Frame 	Module 	Signature 	Source
  0 	libxul.so 	mozilla::dom::CrashReporterParent::GenerateChildData 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/ipc/CrashReporterParent.cpp:114
  1 	libxul.so 	mozilla::plugins::PluginModuleChromeParent::ProcessFirstMinidump 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:1415
  2 	libxul.so 	mozilla::plugins::PluginModuleChromeParent::ActorDestroy 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:1503
  3 	libxul.so 	mozilla::plugins::PPluginModuleParent::DestroySubtree 	/build/firefox-4CFcvq/firefox-39.0+build5/obj-x86_64-linux-gnu/ipc/ipdl/PPluginModuleParent.cpp:1588
  4 	libxul.so 	mozilla::plugins::PPluginModuleParent::OnChannelError 	/build/firefox-4CFcvq/firefox-39.0+build5/obj-x86_64-linux-gnu/ipc/ipdl/PPluginModuleParent.cpp:1462
  5 	libxul.so 	mozilla::ipc::MessageChannel::NotifyMaybeChannelError 	/build/firefox-4CFcvq/firefox-39.0+build5/ipc/glue/MessageChannel.cpp:1622
  6 	libxul.so 	mozilla::ipc::MessageChannel::Close 	/build/firefox-4CFcvq/firefox-39.0+build5/ipc/glue/MessageChannel.cpp:1744
  7 	libxul.so 	mozilla::plugins::PluginModuleParent::DoShutdown 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:2326
  8 	libxul.so 	mozilla::plugins::PluginModuleParent::NP_Shutdown 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:2307
  9 	libxul.so 	mozilla::plugins::PluginModuleChromeParent::~PluginModuleChromeParent 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:705
  10 	libxul.so 	mozilla::plugins::PluginModuleChromeParent::~PluginModuleChromeParent 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/ipc/PluginModuleParent.cpp:741
  11 	libxul.so 	nsNPAPIPlugin::~nsNPAPIPlugin 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/base/nsNPAPIPlugin.cpp:237
  12 	libxul.so 	nsNPAPIPlugin::~nsNPAPIPlugin 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/base/nsNPAPIPlugin.cpp:239
  13 	libxul.so 	nsNPAPIPlugin::Release 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/base/nsNPAPIPlugin.cpp:224
  14 	libxul.so 	nsPluginHost::Notify 	/build/firefox-4CFcvq/firefox-39.0+build5/dom/plugins/base/nsPluginHost.cpp:3716
  15 	libxul.so 	nsTimerImpl::Fire 	/build/firefox-4CFcvq/firefox-39.0+build5/xpcom/threads/nsTimerImpl.cpp:634
  16 	libxul.so 	nsTimerEvent::Run 	/build/firefox-4CFcvq/firefox-39.0+build5/xpcom/threads/nsTimerImpl.cpp:724
  17 	libxul.so 	nsThread::ProcessNextEvent 	/build/firefox-4CFcvq/firefox-39.0+build5/xpcom/threads/nsThread.cpp:855
  18 	libxul.so 	NS_ProcessNextEvent 	/build/firefox-4CFcvq/firefox-39.0+build5/xpcom/glue/nsThreadUtils.cpp:265
  19 	libxul.so 	mozilla::ipc::MessagePump::Run 	/build/firefox-4CFcvq/firefox-39.0+build5/ipc/glue/MessagePump.cpp:140
  20 	libxul.so 	MessageLoop::Run 	/build/firefox-4CFcvq/firefox-39.0+build5/ipc/chromium/src/base/message_loop.cc:226
  21 	libxul.so 	nsBaseAppShell::Run 	/build/firefox-4CFcvq/firefox-39.0+build5/widget/nsBaseAppShell.cpp:164
  22 	libxul.so 	nsAppStartup::Run 	/build/firefox-4CFcvq/firefox-39.0+build5/toolkit/components/startup/nsAppStartup.cpp:281
  23 	libxul.so 	XREMain::XRE_mainRun 	/build/firefox-4CFcvq/firefox-39.0+build5/toolkit/xre/nsAppRunner.cpp:4170
  24 	libxul.so 	XREMain::XRE_main 	/build/firefox-4CFcvq/firefox-39.0+build5/toolkit/xre/nsAppRunner.cpp:4250
  25 	libxul.so 	XRE_main 	/build/firefox-4CFcvq/firefox-39.0+build5/toolkit/xre/nsAppRunner.cpp:4469
  26 	firefox 	do_main 	/build/firefox-4CFcvq/firefox-39.0+build5/browser/app/nsBrowserApp.cpp:294
  27 	firefox 	main 	/build/firefox-4CFcvq/firefox-39.0+build5/browser/app/nsBrowserApp.cpp:667
  28 	libc-2.19.so 	__libc_start_main 	/build/buildd/eglibc-2.19/csu/libc-start.c:287
  Ø 29 	libstdc++.so.6.0.19 	libstdc++.so.6.0.19@0x2ee4bf
  30 	firefox 	_init
  31 	firefox 	_GLOBAL__sub_I_SSE.cpp 	/build/firefox-4CFcvq/firefox-39.0+build5/mozglue/build/SSE.cpp:146
  32 		@0x7ffe8ecf056f
  33 	ld-2.19.so 	_dl_init 	/build/buildd/eglibc-2.19/elf/dl-init.c:36
  34 	firefox 	_GLOBAL__sub_I_SSE.cpp 	/build/firefox-4CFcvq/firefox-39.0+build5/mozglue/build/SSE.cpp:146
  35 		@0x7ffe8ecf056f
  36 	firefox 	_start
  37 		@0x7ffe8ecf0567

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