Public bug reported:

Using firefox-trunk on:
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.4 LTS
Release:        14.04
Codename:       trusty

The firefox is not usable, on any URL I get:
Bad news first: This tab has crashed  Now for the good news: You can just close 
this tab, restore it or restore all your crashed tabs.

This is the stack trace:
|⇒  firefox-trunk

(firefox-trunk:12761): GLib-GObject-CRITICAL **: g_object_unref:
assertion 'object->ref_count > 0' failed

(firefox-trunk:12761): GLib-GObject-CRITICAL **: g_object_unref:
assertion 'object->ref_count > 0' failed

Sandbox: seccomp sandbox violation: pid 12870, syscall 56, args 18874385 0 0 
140336228863376 12870 140336228862656.  Killing process.
Sandbox: crash reporter is disabled (or failed); trying stack trace:
Sandbox: frame #01: __libc_fork[/lib/x86_64-linux-gnu/libc.so.6 +0xc0ee4]
Sandbox: frame #02: ???[/lib/x86_64-linux-gnu/libglib-2.0.so.0 +0x8c54c]
Sandbox: frame #03: g_spawn_sync[/lib/x86_64-linux-gnu/libglib-2.0.so.0 
+0x8ce18]
Sandbox: frame #04: 
g_spawn_command_line_sync[/lib/x86_64-linux-gnu/libglib-2.0.so.0 +0x8d517]
Sandbox: frame #05: 
_ZNK6Oxygen10QtSettings10runCommandERKSsRPc[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0x9a749]
Sandbox: frame #06: 
_ZNK6Oxygen10QtSettings17kdeConfigPathListEv[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0x9d050]
Sandbox: frame #07: 
_ZN6Oxygen10QtSettings10initializeEj[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0xaa0f7]
Sandbox: frame #08: 
_ZN6Oxygen5Style10initializeEj[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0xc58b0]
Sandbox: frame #09: 
_ZN6Oxygen5Style8instanceEv[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0xc5cf5]
Sandbox: frame #10: 
_ZN6Oxygen13ThemingEngine12instanceInitEP19OxygenThemingEngine[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0xf1559]
Sandbox: frame #11: 
g_type_create_instance[/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 +0x30e3b]
Sandbox: frame #12: ???[/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 +0x15355]
Sandbox: frame #13: g_object_newv[/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 
+0x1710d]
Sandbox: frame #14: g_object_new[/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 
+0x178bc]
Sandbox: frame #15: 
create_engine[/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/liboxygen-gtk.so
 +0xf0f0a]
Sandbox: frame #16: 
gtk_theming_engine_load[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x27a385]
Sandbox: frame #17: ???[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x1165de]
Sandbox: frame #18: ???[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x121188]
Sandbox: frame #19: 
gtk_css_provider_load_from_file[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 
+0x1221ea]
Sandbox: frame #20: 
gtk_css_provider_load_from_path[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 
+0x122276]
Sandbox: frame #21: ???[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x122525]
Sandbox: frame #22: ???[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x21b7af]
Sandbox: frame #23: 
gtk_settings_get_for_screen[/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 +0x21bb6f]
Sandbox: frame #24: ???[/usr/lib/firefox-trunk/libxul.so +0x1f1deaa]
Sandbox: frame #25: ???[/usr/lib/firefox-trunk/libxul.so +0x1ef608e]
Sandbox: frame #26: ???[/usr/lib/firefox-trunk/libxul.so +0x1ef768f]
Sandbox: frame #27: ???[/usr/lib/firefox-trunk/libxul.so +0x2384c78]
Sandbox: frame #28: ???[/usr/lib/firefox-trunk/libxul.so +0x1d9da09]
Sandbox: frame #29: ???[/usr/lib/firefox-trunk/libxul.so +0x1d9fd06]
Sandbox: frame #30: ???[/usr/lib/firefox-trunk/libxul.so +0x1d9fda8]
Sandbox: frame #31: ???[/usr/lib/firefox-trunk/libxul.so +0xf245f6]
Sandbox: frame #32: ???[/usr/lib/firefox-trunk/libxul.so +0xd38aa1]
Sandbox: frame #33: ???[/usr/lib/firefox-trunk/libxul.so +0xd40cae]
Sandbox: frame #34: ???[/usr/lib/firefox-trunk/libxul.so +0xd42d88]
Sandbox: frame #35: ???[/usr/lib/firefox-trunk/libxul.so +0xd34edb]
Sandbox: frame #36: ???[/usr/lib/firefox-trunk/libxul.so +0xd33d9f]
Sandbox: frame #37: ???[/usr/lib/firefox-trunk/libxul.so +0xa59dc7]
Sandbox: frame #38: ???[/usr/lib/firefox-trunk/libxul.so +0xa74466]
Sandbox: frame #39: ???[/usr/lib/firefox-trunk/libxul.so +0xd35126]
Sandbox: frame #40: ???[/usr/lib/firefox-trunk/libxul.so +0xd1fd34]
Sandbox: frame #41: ???[/usr/lib/firefox-trunk/libxul.so +0x1eea51f]
Sandbox: frame #42: XRE_RunAppShell[/usr/lib/firefox-trunk/libxul.so +0x254a411]
Sandbox: frame #43: ???[/usr/lib/firefox-trunk/libxul.so +0xd1fd34]
Sandbox: frame #44: XRE_InitChildProcess[/usr/lib/firefox-trunk/libxul.so 
+0x254abc1]
Sandbox: frame #45: ???[/usr/lib/firefox-trunk/plugin-container +0x992d]
Sandbox: frame #46: __libc_start_main[/lib/x86_64-linux-gnu/libc.so.6 +0x21f45]
Sandbox: frame #47: ???[/usr/lib/firefox-trunk/plugin-container +0x9334]
Sandbox: frame #48: ??? (???:???)
Sandbox: end of stack.
[Parent 12761] WARNING: pipe error (70): Connection reset by peer: file 
/build/firefox-trunk-QbUdjK/firefox-trunk-50.0~a1~hg20160709r304329/ipc/chromium/src/chrome/common/ipc_channel_posix.cc,
 line 320

###!!! [Parent][MessageChannel] Error:
(msgtype=0x2C007D,name=PBrowser::Msg_Destroy) Channel error: cannot
send/recv

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

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https://bugs.launchpad.net/bugs/1602910

Title:
  firefox-trunk: Bad news first: This tab has crashed  Now for the good
  news: You can just close this tab, restore it or restore all your
  crashed tabs.

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