First thing you could try is disabling any add-ons and seeing if it still crashes. You should also do a full sweep with your AV software though. It could be that something nasty is trying to take control and that is the result.
Web Designer / Developer. Currently working on Paphos Life.
Living in Polemi, Cyprus with my wife and daughter.
I still have Firefox, and it is certainly not 'Edge', and I am having no problems at all.
Firefox have very recently released a new update... Can you check on the Firefox page that you have the latest version..
I would also run Malwarebytes and Ccleaner.
I have Firefox, Opera, Internet Explorer, Chrome and Edge on my pc. I too have problems with programmes that open with Firefox which crashes almost every time. Has been happening for several months now. I assumed it was a conflict of some sort and haven't looked into whether it is updating automatically or not so I will check for that.
Jeanne
Hanging on in quiet desperation is the English way
I use Firefox for business, running our website admin and sales, stats monitoring as well as our eBay accounts. I have 4 tabs which open automatically when I switch my laptop on and they're open all day until I log off around midnight.
I'm not experiencing any problems using Firefox. I'm using version 56, if that helps any....
I use Chrome for my social media stuff and Edge for news and forums viewing.