Your question lacks information. Please provide some steps to reproduce the crash. Also mentions which site causes it and how you triggered it.

Product Firefox Release Channel beta Version 52.0b5 Build ID 20170209120619 OS Windows 10 OS Version 10.0.10586

bp-dfa54799-3298-44cb-a8ed-be1200170709 Signature: mozilla::BaseAutoLock<T>::BaseAutoLock<T>

Attention Sumo's there are 5 related bug reports

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Note that this is an old crash report

• Firefox 52.0b5 Crash Report [@ mozilla::BaseAutoLock<T>::BaseAutoLock<T> ]
  CrashTime: Sun, 09 Jul 2017 15:03:47 GMT

Don't you have a recent crash report?