Firefox crashes

Since installing the latest Java update and Version 15 of Firefox, Firefox has been crashing when going to certain websites (example: the java website where you check the Java version on your system). When going to the above website, Firefox seems to close but when you click to restart it you get a window that says Firefox is already running. You have to then go to Task Manager Processes and close the firefox.exe *32 process. Then, when you re-start Firefox, it doesn't automatically go to your home screen. You have to hit the home button. If you than close Firefox and re-start it, it will go to your home page normally. Since I updated to Version 15 of Firefox and installed the new Java update at the same time, I don't know which is causing the problem.