I was happy with Firefox Preloader only for a few days. Then it started hanging Firefox altogether and then crashing when I wanted to close it. From what I can remember my current Firefox profile is at least an year old. I copy it from computer to computer. So I created new profile to see if it makes a difference. To get to the Firefox profile manager run Firefox like this. firefox /profilemanager I copied my signons2.txt and key3.db to migrate my passwords over. Now Firefox starts up in a few seconds and runs well. Now I have to install my old extensions and it should be good to go. You can find more about your Firefox profile folder here.