Product Firefox Release Channel release Version 51.0.1 Build ID 20170125094131 OS Windows 10 OS Version 10.0.14393

Signature: shutdownhang | mozilla::CondVar::Wait | nsEventQueue::GetEvent | nsThread::ProcessNextEvent | CAMD64StackTrav::Unwind

atidxx32.dll = Advanced Micro Devices = Check this link;
http://support.amd.com/en-us/download/desktop?os=Windows+7+-+64

Try to disable multi-process tabs in Firefox.

You can disable multi-process tabs in Firefox by setting the related prefs to false on the about:config page.

• browser.tabs.remote.autostart = false
• browser.tabs.remote.autostart.2 = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config