Please see if you have reports to send as per instructions in this URL that match your dates. https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support Please do this as I see you have a couple : Mozilla experiment, called 'Shield Studies'. Without even knowing it, you may have volunteered for this Mozilla experiment. Would you go to : Options => Privacy & Security => under 'Data Collection and Use' : Did you uncheck : 'Allow Firefox to install and run studies ' or is it checked ? To check if you are enrolled in these studies : Type in the address bar about:studies Any extensions that you see listed there, you can either disable or remove, just like this Safe Browsing version 4 (at the end of the experiment they will be disabled anyway). See for further information : https://support.mozilla.org/en-US/kb/shield Please leave send info to Mozilla ticked or I would not have know this. You can try to modify multi-process settings to see if this has effect. You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. set dom.ipc.processCount to 1 if it is currently set to a higher value (4) disable multi-process windows in Firefox You can disable multi-process windows in Firefox by setting these prefs to false on the about:config page. browser.tabs.remote.autostart = false browser.tabs.remote.autostart.2 = false http://kb.mozillazine.org/about:config Also can reverse everything this tells you to enable it. http://www.ghacks.net/2016/07/22/multi-process-firefox/ Restart Firefox Your Video Card Drivers are from 1-30-2015 Beschrijving: NVIDIA GeForce 7100 / NVIDIA nForce 630i Please let us know if this solved your issue or if need further assistance.

Hello, The problem is solved. Thanx. I think this: browser.tabs.remote.autostart = false browser.tabs.remote.autostart.2 = false did it! Regards, Geert1964