I am a long time user of Firefox (decades) and it has almost never crashed. I can't remember the last time. It is on all 4 of my PCs. One problem might be the add ons and plug ins you use. There were problems with Adobe Flash a few months back. It was Adobe's issue not Firefox. Be sure you are using the latest versions of everything as well.
Personally, I had no idea that this had anything to do with Adobe; everybody seemed to be heaping the blame on Firefox. I will try going back to this browser then see how everything goes.