Firefox will crash while I am using the internet...no warning, no apparent reason...just an apology for the crash. Why?

Today, when using an Adobe application Firefox did not recognize or allow the website to recognize that "cookies" WERE enabled. I kept receiving a message that the website could not proceed until same was enabled. Even after several redoing the enabling instructions, the message report the cookies were NOT enabled. Yet, as I write this the screen menu drop down in Tools, Options shows the cookies is programmed and are enabled. Why? How to fix?