I couldn't open Firefox. It would instantly crash - a window would flash and then I would see the Mozilla Crash Reporter . I restarted my computer. It continued to instantly crash. I went online and downloaded the most recent version of Firefox. Just as it finished installing a window popped up with some kind of an error, I closed out of it and did not see the Mozilla Crash Reporter. I un-installed Firefox. Went back to the website and downloaded and installed the latest version of Firefox again. This time it installed without problem, but still crashed instantly when I clicked to open it. I couldn't test Firefox in safe mode because I couldn't access the top of the Firefox window, seeing how no window came up. Then I saw that you can start Firefox in safe mode by pressing shift and did that. The Firefox Safe Mode window popped up and I checked all the options ("Disable all add-ons", "Reset toolbars and controls", etc.) and clicked "Make Changes and Restart". The window closed and the Mozilla Crash Reporter popped up. I started Firefox in safe mode again and clicked "Continue in Safe Mode". Finally, the Firefox window came up! Now if I could just get it to work outside of safe mode...