hello, could you provide your latest few submitted crash reports? please enter about:crashes into the firefox location bar, copy the latest few report ids from there starting with bp- & paste them here into a forum reply. this will give us a better understanding what may be triggering those crashes.

Thanks! Here are the last four: bp-e56340fb-ceb6-4e64-baee-c55ef2160310 10/03/2016 12:16 bp-9aa38a42-fd76-430b-9d27-0a7f52160310 10/03/2016 11:31 bp-1106d3cc-21ad-4522-ab38-42f6f2160310 10/03/2016 11:13 bp-368acea5-1d2a-4007-bfef-6c2512160310

thank you for following up. unfortunately those crashes appear to be caused by trusteer rapport which is running on your device and hooking into firefox (not dependant on your OS version) - please check that you are fully updated there or temporarily disable/uninstall that software for the moment.

please also get in contact with trusteer's support which are usually very quick to respond and fix issues like this: https://trusteer.secure.force.com/PKB/articles/en_US/FAQ/browser-crashes