I went thru this and got some good advice on this forum that solved all my issues. After an update, look at your addons, and remove any that are not supported. If you still have trouble, pull the working addons one at a time until you find the one that is causing the crashes.
Sometimes you have to wait for an update to the plugin, but often uninstalling the add on, closing firefox,re booting your computer, then opening FF and adding the plugin back in will fix the problem.
I'm on FF 23.0.1, and a raft of tools, only having a flash crash every once in a while.
It's not FF, its the plugins.