Firefox crashes on exit

[ghost]

Firefox 46.0.1.5966 french version, Privacy Badger 1.7.0 (automatic updates turned on)
Window 7 64bits, Bitdefender Total Security 2016 version 20.0.27.1467.

Firefox crashes upon every exiting, with 1 or several tabs open, once I have browsed at least 1 page (maybe need to have Privacy Badger working). It does not crash in Safe Mode, nor when I unactivate Privacy Badger (I tried all add-on one by one).

I got a window saying "Firefox has stopped working. A problem caused the program to stop working correctly. Please close the program". When closed, the same window open once again, then Firefox closes apparently correctly.