Firefox 1.07 crashing on startup.

I’m not sure why yet, but two machines that I have installed firefox 1.07 on are crashing on startup. I’m figuring it is an imcompatible extension as it seems stable until the extensions are loaded. A new profile fixes things but it is rather annoying. I’ve lots of extensions so it is taking a long time to test them, especially as you have to restart firefox each time you change an extension 🙁